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.
19 mm
Verification: From our database, not yet verified
39.4 mm case · 2026
Indicative information. Check your watch before buying a strap: whatsmylugwidth.com is not responsible for an incorrect size.
The Omega Constellation Observatory takes a 19 mm strap: all 3 references with a listed width in our database use 19 mm. Check the reference on your case back to be sure.
Omega Constellation Observatory 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.
Constellation Observatory 39.4 Moonshine Gold
Lug width: 19 mm
Source: DatabaseCase size: 39.4 mmYear: 2026Gold dialCase material: Gold
Constellation Observatory 39.4 O-MEGASTEEL
Lug width: 19 mm
Source: DatabaseCase size: 39.4 mmYear: 2026Silver dialCase material: Steel
Constellation Observatory 39.4 Sedna Gold
Lug width: 19 mm
Source: DatabaseCase size: 39.4 mmYear: 2026Silver dialCase material: Gold
No reference matches.
The Omega Constellation Observatory takes a 19 mm strap: all 3 references with a listed width in our database use 19 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 3 Omega Constellation Observatory references, 3 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.