Every reference with a known width takes the same strap size. Your reference is engraved on the case back or between the lugs at 6 o'clock.
20 mm
Verification: Not yet verified
Attachment: spring bars
39.5 mm case
Indicative information. Check your watch before buying a strap: whatsmylugwidth.com is not responsible for an incorrect size.
The Oak & Oscar Humboldt takes a 20 mm strap: all 15 references with a listed width in our database use 20 mm. Check the reference on your case back to be sure.
Oak & Oscar Humboldt 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.
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmGrey dialCase material: 316L Stainless steel
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmNavy dialCase material: 316L Stainless steel
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: 316L Stainless steel
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: 316L Stainless steel
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: 316L Stainless steel
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: 316L Stainless steel
Humboldt The Humboldt ExP-02
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsMatte gray dial
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: 316L Stainless steel
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: 316L Stainless steel
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: 316L Stainless steel
Humboldt The Humboldt GMT 2026 Chicago Edition
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: 316L Stainless steel
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: Grade 5 Titanium case and bezel
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: Grade 5 Titanium case and bezel
Humboldt The Humboldt GMT USSS Edition
Lug width: 20 mm
Source: Not yet verified Attachment: Spring barsLug width: 20 mm
Source: Not yet verified Attachment: Spring barsCase size: 39.5 mmCase material: 316L Stainless steel mid-case and caseback
No reference matches.
The Oak & Oscar Humboldt takes a 20 mm strap: all 15 references with a listed width in our database use 20 mm. Check the reference on your case back to be sure. These widths come from our database and are not yet verified.
From our database, which lists 15 Oak & Oscar Humboldt references, 15 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.
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.