Grand Seiko
Grand Seiko SBGN003 GMT Strap Size — 19mm Lug Width
The Grand Seiko SBGN003 GMT has a 19mm lug width, so it takes a 19mm watch strap.
Lug width19mm
| Lug width | 19 mm |
|---|---|
| Case size | 39 mm |
| Lug-to-lug | 46 mm |
| Thickness | 12.1 mm |
| Spring bar Ø (typical) | Not confirmed |
| End type | Straight |
Strap styles that fit
- NATO / Zulu19mm fits if the strap's thickness clears the case under the bars.
- PerlonWoven pass-through, 19mm.
- 2-piece leatherStraight ends fit flush.
- Rubber / siliconeDivers & sports fit well.
- Milanese / meshStraight-end 19mm mesh fits.
- Metal braceletNeeds 19mm end-links shaped for this case.
▲ 19mm lugs. Many strap ranges skip this size, so check the width before you buy.
Fit & sizing notes for the SBGN003 GMT
- Width: buy 19mm straps. Tapered straps listed as 19/17mm or 19/15mm fit too; only the first number has to match. See strap sizes explained.
- Spring bars: 19mm long. We haven't confirmed the diameter for this model, so measure the old bar before buying replacements (spring bar sizes).
- Odd size: 19mm straps are harder to find; a 18mm strap fits with a small gap, but never go wider. Odd lug width options.
- Wrist fit: at 46mm lug-to-lug it should sit within the top of wrists from about 15.3cm up (rule of thumb: lug-to-lug under ~30% of wrist size). That's longer than 22% of the watches in our index. See what size watch suits your wrist.
- Strap thickness: at 12.1mm thick it's mid-thickness, so most straps suit it; padded leather and NATOs both balance well.
Sources & corrections
Lug width checked against: StrapsCo: SBGN003; The Seiko Guy: SBGN003; Worn & Wound: SBGN003 owner's review. Last checked 26 October 2026.
Spec wrong for your watch? Send us a correction with your reference number.
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Grand Seiko SBGN003 GMT — strap questions
What size strap does the SBGN003 GMT take?
The Grand Seiko SBGN003 GMT has a 19mm lug width, so you need a 19mm watch strap.
Will any 19mm strap fit the SBGN003 GMT?
Most will. Width is the main thing to match, but also check that the strap's spring-bar holes suit the bars, and that the strap is thin enough to clear the case between the lugs. A metal bracelet needs 19mm end-links made for this model.
What spring bar size does the SBGN003 GMT use?
19mm long. We haven't confirmed the diameter for the SBGN003 GMT, so measure the original bar with calipers before buying replacements.
Is the SBGN003 GMT good for strap swapping?
Yes. With standard 19mm spring-bar lugs, NATO, leather, rubber and mesh straps can all be fitted with a spring-bar tool.