AL‑525BR4H4
Seastrong Diver 300 Heritage Automatic
Lug width: 21 mm
Source: Two sourcesCase size: 41.5 mmBrown dialCase material: Stainless steel
- Attachment
- classic lugs
- Status
- Two sources agree
Alpina Seastrong Diver 300 Heritage
The strap size depends on the reference. Yours is engraved on the case back or between the lugs at 6 o'clock.
21 or 21.15 mm
Verification: Two sources agree on ref. AL‑525BR4H4 and AL‑525G4H6
41.5 to 42 mm cases
Filter references by lug width
Indicative information. Check your watch before buying a strap: whatsmylugwidth.com is not responsible for an incorrect size.
Collection6 references
6 Alpina Seastrong Diver 300 Heritage references
Lug width
Case size
Alpina Seastrong Diver 300 Heritage 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.
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AL‑525G4H6
Seastrong Diver 300 Heritage Automatic
Lug width: 21 mm
Source: Two sourcesCase size: 41.5 mmGrey dialCase material: Stainless steel
- Attachment
- classic lugs
- Status
- Two sources agree
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AL‑525BRC4H4
Seastrong Diver 300 Heritage Automatic
Lug width: 21 mm
Source: DatabaseCase size: 41.5 mmBrown dialCase material: Stainless steel
- Attachment
- classic lugs
- Status
- Listed in our database, not yet verified
-
AL‑525S4H6
Seastrong Diver 300 Heritage Beige Strap
Lug width: 21 mm
Source: DatabaseCase size: 42 mmBeige dialCase material: Stainless steel
- Style
- sport
- Movement
- Automatic Cal.400
- Caseback
- Sapphire back
- Production
- 2020, present
- Status
- Listed in our database, not yet verified
-
AL‑520BY4H6
Seastrong Diver 300 Heritage Black Brown Leather
Lug width: 21.15 mm
Source: DatabaseCase size: 42 mmBlack dialCase material: Stainless steel
- Style
- sport
- Movement
- Automatic Cal.400
- Caseback
- Sapphire back
- Production
- 2020, present
- Status
- Listed in our database, not yet verified
-
AL‑520GR4H6
Seastrong Diver 300 Heritage Green Rubber
Lug width: 21 mm
Source: DatabaseCase size: 42 mmGreen dialCase material: Stainless steel
- Style
- sport
- Movement
- Automatic Cal.400
- Caseback
- Sapphire back
- Production
- 2020, present
- Status
- Listed in our database, not yet verified
No reference matches.
FAQ
What lug width does the Alpina Seastrong Diver 300 Heritage use?
Alpina Seastrong Diver 300 Heritage lug width: 21 or 21.15 mm depending on the reference. The most common is 21 mm (5 of the 6 references with a listed width in our database). Find your exact reference in the table below. The Alpina Seastrong Diver 300 Heritage ref. AL-525BR4H4 and AL-525G4H6 take 21 mm (two independent sources agree).
Do all Alpina Seastrong Diver 300 Heritage references take the same strap?
No. 2 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.
Where do these Alpina Seastrong Diver 300 Heritage lug widths come from?
From our database, which lists 6 Alpina Seastrong Diver 300 Heritage references, 6 of them with a listed width. Each reference card says whether the maker lists the width, two independent sources agree on it, or it is not yet verified.
Other Alpina collections
- Alpiner Extreme13.5 to 17 mm
- Alpiner Extreme Automatic16 to 24.8 mm
- Alpiner Extreme Quartz21.7 mm
- Alpiner Extreme Regulator14 or 16 mm
- Alpiner Extreme Regulator Automatic16 mm
- Alpiner Extreme Solarmetre15.25 or 24.8 mm
- Avalanche Automatic16 mm
- Seastrong Diver Extreme15.25 mm
- Startimer Pilot20 to 22 mm
- Startimer Pilot Automatic20 to 21.15 mm
- Startimer Pilot Chronograph Big Date21 mm
- Startimer Pilot Heritage20 to 23 mm
Help
What is lug width?
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.
Measure it in 30 seconds
- Take the strap off, or look at the back of it: many straps print their width.
- Measure the inside gap between the lugs with a caliper or a millimetre ruler.
- Round to the nearest whole millimetre. Most watches use 18, 20 or 22 mm.
Strap, quick release or system?
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.