The strap size depends on the reference. Yours is engraved on the case back or between the lugs at 6 o'clock.
20 or 21 mm
Verification: From our database, not yet verified
36.7 to 40.5 mm cases · 2010 to 2015
Indicative information. Check your watch before buying a strap: whatsmylugwidth.com is not responsible for an incorrect size.
The story · Since 1991
In 1996 Patek Philippe put a new complication on the wrist: a calendar that knows 30-day from 31-day months and asks to be set only once a year, at the end of February. It started as a student's diploma thesis at the Geneva engineering school and was voted Watch of the Year within months.
1
Manual date correction needed per year, at the end of February
Worn by
Philippe Stern wanted a useful complication between the simple date and the perpetual calendar. A diploma project with the Geneva engineering school produced a mechanism built from wheels rather than levers, steered by a feeler nicknamed the Dolphin. Its student author, Cedric Fague, joined Patek Philippe.
The 37 mm ref. 5035 was unveiled at Basel in 1996 and, in 1997, cost roughly CHF 18,300, less than half a perpetual calendar. The 5036 of 1998 added moon phase and power reserve and the first gold bracelet; limited runs followed for Tiffany in 2001 and Wempe in 2003.
The tonneau Gondolo Calendario ref. 5135 of 2004 brought the faster calibre 324 and the arched day, date and month windows. Ladies' models, a 39 mm ref. 5146, silicon Advanced Research pieces, the Calatrava-style 5396 and the 5960 chronograph followed within a few years.
The 40 mm ref. 5205 arrived in 2010 with skeletonised lugs, and the same year the annual calendar entered the Nautilus as ref. 5726. A regulator, ref. 5235, followed in 2011, a steel 5960/1A on bracelet in 2014, and the 42 mm chronograph ref. 5905 in 2015.
By its 20th anniversary in 2016 the complication existed in 21 versions, and the new 5396 was number 22. A steel 5905/1A appeared in 2021 and a Travel Time annual calendar, ref. 5326G, in 2022. In 2026 Swisswatches counted 17 annual calendars among about 160 current Patek references.
The fighter unboxed a platinum annual calendar chronograph ref. 5905P with a green dial, one of 25 made for Dublin jeweller Weir & Sons, and said he had number 12.
THR listed a steel annual calendar flyback chronograph ref. 5905/1A with olive green dial among his Patek Philippes, in a year when he was spotted wearing six Pateks.
Presented at Basel in spring 1996, the 5035 was named Watch of the Year by the Swiss magazine Montres Passion that autumn. Juror Nicholas Foulkes later recalled a unanimous decision.
A circa 2018 Nautilus Annual Calendar ref. 5726/1A-010 sold for USD 165,100 at the Phillips New York Watch Auction: XII in June 2025.
The 2006 ref. 5960 introduced calibre CH 28-520, the first automatic chronograph developed and made entirely in-house by Patek, where earlier chronographs relied on Lemania or Valjoux bases.
First Patek combining the annual calendar with Travel Time; the date follows local time, and the calendar changeover was cut to about 18 minutes.
Successor of the 5960P with concentric-circle dial and square chronograph pushers.
Case grew to 42 mm in platinum. The steel 5905/1A of 2021 has a dark green dial.
Day, date and month in three apertures along an arc, moon phase and 24-hour indication at 6 o'clock. Rose gold joined in 2013.
40 mm case with skeletonised lugs; delivered on hand-stitched alligator with a prong buckle.
The first Nautilus with annual calendar, moon phase and 24-hour display, in steel with a grey dial.
Launched on a leather strap only; a 40.5 mm steel bracelet version followed in 2012 and the blue-dial 5726/1A in 2019.
First annual calendar chronograph, on the in-house column-wheel flyback calibre CH 28-520 IRM QA 24H, with minutes and hours on one subdial at 6 o'clock. Launched in platinum.
A new base model for men with finer dials, in gold or platinum.
Case grew from 37 to 39 mm; ref. 5146 came on alligator, ref. 5146/1 on a gold bracelet.
First annual calendar with calibre 324 QA at 4 Hz and the arched three-window display of day, date and month.
Tonneau case of 38 x 51 mm.
Moon phase replaced the 24-hour scale and a power reserve indicator sat at 12 o'clock.
37 mm, and the first annual calendar with a matching gold bracelet made for it.
Calibre 315 S QA 24H, day and month on subdials, date window and 24-hour indicator at 6 o'clock, Roman numerals. Made in yellow, white and rose gold and platinum.
37 mm case.
Patek Philippe Annual Calendar references in our database. Each card says where its width comes from: listed by the maker (linked to the maker's page in the details), two independent sources agree, or listed in our database and not yet verified by us.
Annual Calendar 5205G Blue
Lug width: 20 mm
Source: DatabaseCase size: 40 mmYear: 2010Blue dialCase material: White Gold
Annual Calendar 5205G Grey
Lug width: 20 mm
Source: DatabaseCase size: 40 mmYear: 2010Grey dialCase material: White Gold
Annual Calendar 5205R Black
Lug width: 20 mm
Source: DatabaseCase size: 40 mmYear: 2014Black dialCase material: Rose Gold
Annual Calendar 5205R White
Lug width: 20 mm
Source: DatabaseCase size: 40 mmYear: 2015White dialCase material: Rose Gold
Annual Calendar 5905P Blue
Lug width: 22 mm
Source: DatabaseCase size: 42 mmYear: 2015Blue dialCase material: Platinum
Annual Calendar 5905R Brown
Lug width: 22 mm
Source: DatabaseCase size: 42 mmYear: 2019Brown dialCase material: Rose Gold
Annual Calendar 40930463 As09918
Lug width: 21 mm
Source: DatabaseAnnual Calendar
Lug width: 19 mm
Source: DatabaseCase size: 37 mmWhite dialCase material: Rose Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 38 mmSilver dialCase material: White Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 36.7 mmBlue / Navy dial
Annual Calendar
Lug width: 19 mm
Source: DatabaseCase size: 37 mmPink/Salmon dial
Annual Calendar
Lug width: 19 mm
Source: DatabaseWhite dial
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 38.6 mmMulti dialCase material: White Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 38.6 mmMulti dialCase material: White Gold
Annual Calendar
Lug width: 21 mm
Source: DatabaseCase size: 39.5 mmGrey dialCase material: White Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 39.5 mmBrown dialCase material: Rose Gold
Annual Calendar
Lug width: 21 mm
Source: DatabaseCase size: 39.5 mmBlue dialCase material: Platinum
Annual Calendar
Lug width: 21 mm
Source: DatabaseCase size: 39.5 mmMulti-Color dialCase material: White Gold
Annual Calendar 5146 Rose Gold / Cream / Bracelet (Natural / Cream Dial)
Lug width: 20 mm
Source: DatabaseCase size: 39 mmBeige dialCase material: Rose Gold
Annual Calendar 5146 Yellow Gold / Cream (Natural / Cream Dial)
Lug width: 20 mm
Source: DatabaseCase size: 39 mmBeige dialCase material: Yellow Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 39 mmBeige dialCase material: White Gold
Annual Calendar
Lug width: 19 mm
Source: DatabaseCase size: 39 mmBeige dialCase material: White Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 39 mmBeige dialCase material: White Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 39 mmGrey dialCase material: Yellow Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 39 mmBeige dialCase material: Rose Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 39 mmBlue dialCase material: White Gold
Annual Calendar
Lug width: 21 mm
Source: DatabaseCase size: 39 mmSilver dialCase material: Yellow Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 38 mmMulti-Color dialCase material: White Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 39 mmSkeleton dialCase material: White Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 38.5 mmBlue dialCase material: Platinum
Annual Calendar
Lug width: 22 mm
Source: DatabaseCase size: 39.8 mmSilver dialCase material: Platinum
Annual Calendar 5396 Rose Gold / Blue (Blue / Navy Dial)
Lug width: 21 mm
Source: DatabaseCase size: 38.5 mmBlue dialCase material: Rose Gold
Annual Calendar 5396 Rose Gold / Blue / Baguette (Blue / Navy Dial)
Lug width: 21 mm
Source: DatabaseCase size: 38.5 mmBlue dialCase material: Rose Gold
Annual Calendar 5396 Rose Gold Brown Bracelet (Brown Dial)
Lug width: 20 mm
Source: DatabaseCase size: 38 mmBrown dialCase material: White Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 38 mmBlue dialCase material: White Gold
Annual Calendar
Lug width: 21 mm
Source: DatabaseCase size: 38.5 mmSilver dialCase material: White Gold
Annual Calendar
Lug width: 21 mm
Source: DatabaseCase size: 38.5 mmGrey dialCase material: White Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 39 mmPink dialCase material: Platinum
Annual Calendar
Lug width: 21 mm
Source: DatabaseCase size: 40.5 mmBlack dialCase material: Rose Gold
Annual Calendar
Lug width: 21 mm
Source: DatabaseCase size: 40.5 mmBlack dialCase material: Rose Gold
Annual Calendar
Lug width: 21 mm
Source: DatabaseCase size: 40.5 mmBlack dialCase material: Platinum
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 40 mmSilver dialCase material: White Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 40 mmSilver dialCase material: Yellow Gold
Annual Calendar
Lug width: 20 mm
Source: DatabaseCase size: 40 mmSilver dialCase material: Rose Gold
Annual Calendar
Lug width: 18 mm
Source: DatabaseCase size: 36 mmBrown dialCase material: White Gold
Annual Calendar
Lug width: 18 mm
Source: DatabaseCase size: 36 mmBlue dialCase material: White Gold
Annual Calendar As10897
Lug width: 20 mm
Source: DatabaseCase size: 40.2 mmBlack dialCase material: White Gold
Annual Calendar Chronograph As11279
Lug width: 21 mm
Source: DatabaseCase size: 40.5 mmBlue dialCase material: White Gold
Annual Calendar Italian Annual Calendar As11702
Lug width: 19 mm
Source: DatabaseNo reference matches.
Patek Philippe Annual Calendar references use 19 mm or 20 mm or 21 mm depending on the reference and case size, so check yours in the list below. The most common is 20 mm (26 of 49 references with a known width). These widths come from our database and are not yet verified.
No. 5 different lug widths appear across the line, often by case size or generation. Check the reference engraved on the case back or between the lugs.
Once a year. The mechanism tells 30-day months from 31-day months and only needs a correction at the end of February.
A hand-stitched shiny black alligator strap with square scales and a gold prong buckle matching the case.
Yes. The 5036/1 of 1998 introduced a gold bracelet, the 5146/1 used gold bracelets, the 5960/1A of 2014 was the first annual calendar chronograph in steel on a steel bracelet, and the current 4947/1A has an integrated metal bracelet.
From 36 mm for the 2001 Tiffany ref. 5150 and 36.5 mm for the 2003 Wempe ref. 5125, through 37 mm for the original 5035 and the ladies' 4936, 38.5 mm for the 5396, 39 mm for the 5146 and 40 mm for the 5205, up to 42 mm for the 5905 chronograph.
The gap between the two lugs that hold the strap, in millimetres. A new strap must match it exactly: 20 mm lugs take a 20 mm strap.
Most watches use spring bars, so any strap of the right width fits. Many smartwatches use their own band system instead, such as Apple Watch bands or Garmin QuickFit.