Swatch
Swatch MoonSwatch Strap Size — 20mm Lug Width
The Swatch MoonSwatch has a 20mm lug width, so it takes a 20mm watch strap.
| Lug width | 20 mm |
|---|---|
| Case size | 42 mm |
| Lug-to-lug | 47.3 mm |
| Thickness | 13.25 mm |
| Spring bar Ø (typical) | Not confirmed |
| End type | Straight |
Which reference do you have?
Similar-looking models can take different straps. Your reference number is on the case back or your papers.
| Model | Case | Strap |
|---|---|---|
| Bioceramic MoonSwatch models (SO33 references) | 42mm | 20mm |
| Omega Speedmaster Moonwatch (the original) | 42mm | 20mm |
Strap styles that fit
- NATO / Zulu20mm fits if the strap's thickness clears the case under the bars.
- PerlonWoven pass-through, 20mm.
- 2-piece leatherStraight ends fit flush.
- Rubber / siliconeDivers & sports fit well.
- Milanese / meshStraight-end 20mm mesh fits.
- Metal braceletNeeds 20mm end-links shaped for this case.
▲ Bioceramic case: fit spring bars gently, as the lug holes are less forgiving than steel.
Fit & sizing notes for the MoonSwatch
- Width: buy 20mm straps. Tapered straps listed as 20/18mm or 20/16mm fit too; only the first number has to match. See strap sizes explained.
- Spring bars: 20mm long. We haven't confirmed the diameter for this model, so measure the old bar before buying replacements (spring bar sizes).
- Wrist fit: at 47.3mm lug-to-lug it should sit within the top of wrists from about 15.8cm up (rule of thumb: lug-to-lug under ~30% of wrist size). That's longer than 53% of the watches in our index. See what size watch suits your wrist.
- Strap thickness: at 13.25mm thick it's a chunky case: thicker padded leather, rubber/FKM or a heavier NATO balance it visually; very thin straps can look undersized.
The MoonSwatch looks as if it might need special straps, but it uses ordinary spring bars between standard 20mm lugs, so 20mm NATO, leather, rubber and velcro straps all attach. Two cautions. The Bioceramic case is more brittle than steel, so compress the spring bar fully and never lever against the lugs. And owners report that spring-bar hole positions vary slightly between pieces, so a tight curved-end strap may not seat on every watch. A straight-end strap or a NATO is the safe choice.
Sources & corrections
Correction, 24 October 2026: This page previously said the MoonSwatch has an integrated fitting that needs an adapter. That was wrong: it has standard 20mm lugs with spring bars.
Lug width checked against: Delugs: MoonSwatch lug width; Delugs: changing MoonSwatch straps. Last checked 24 October 2026.
Spec wrong for your watch? Send us a correction with your reference number.
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