OMEGA · Seamaster Aqua Terra 150M and Seamaster Railmaster
OMEGA 220.92.43.22.99.001 vs OMEGA 235.10.38.20.06.001
10 published specifications differ between these two, and 4 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.
What differs
| Specification | OMEGA Aqua Terra GMT Worldtimer 43mm, titanium, grey dial220.92.43.22.99.001 | OMEGA Railmaster Co-Axial Master Chronometer 38mm, grey dial235.10.38.20.06.001 |
|---|---|---|
| Case | Titanium, 43 mm | Steel, 38 mm |
| Diameter | 43 mm | 38 mm |
| Thickness | 14.12 mm | 12.36 mm |
| Lug to lug | 50 mm | 44.92 mm |
| Lug width | 21 mm | 19 mm |
| Bracelet | Black rubber strap | Steel |
| Clasp | Foldover clasp in titanium | Foldover butterfly clasp with comfort setting |
| Calibre | Omega 8938 | Omega 8806 |
| Power reserve | 60 hours | 55 hours |
| Movement notes | Listed by OMEGA as a Master Chronometer certified watch. Total product weight approximately 94 g. | Listed by OMEGA as a Master Chronometer certified watch. Total product weight approximately 136 g. |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Water resistance
- 15 bar (150 metres / 500 feet)
- Crystal
- Domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides
- Dial
- Grey
- Movement
- Self winding
What the differences cost you
Each note below follows from the published figures in the tables above — what they mean for intake, for a listing, and for the handover. Nothing here estimates a price or a margin.
One of these is the harder fit
Lug to lug is 50 mm on the 220.92.43.22.99.001 against 44.9 mm on the 235.10.38.20.06.001 — a 5.1 mm difference across the wrist. Diameter is what buyers ask about; lug to lug is what decides whether a case sits flat or overhangs. Ask for a wrist measurement before shipping the 220.92.43.22.99.001, and put the figure in the listing rather than the diameter alone.
These reach different buyers
43 mm on the 220.92.43.22.99.001 against 38 mm on the 235.10.38.20.06.001. Diameter is a poor predictor of how a watch actually sits, but it is the field buyers filter on, so the two land in front of different people. Do not let one listing's photographs or copy stand in for the other.
A visible difference in how they wear
1.8 mm of thickness separates these, with the 220.92.43.22.99.001 the taller at 14.1 mm. That is the difference between a watch that goes under a cuff and one that catches on it — worth a photograph from the side rather than a number in a table.
Different case materials, different handling
The 220.92.43.22.99.001 is titanium and the 235.10.38.20.06.001 is steel. Different case materials mark, polish and refinish differently, so the condition language that fits one will mislead on the other. Photograph and describe each on its own terms.
What to check on each
220.92.43.22.99.001
- Lift it before you judge the size. Ninety-four grams on a 43 mm case is extraordinary, and weight changes how a large watch is received more than diameter does.
- Assess the titanium against titanium rather than against steel. It marks greyer and shallower, so an honestly kept titanium case can read worse under a raking light than a steel one in the same condition.
- Check the titanium clasp specifically. OMEGA specifies the buckle material separately here, and titanium hardware is not interchangeable with a steel donor.
235.10.38.20.06.001
- Quote the 44.92 mm lug to lug. It is under forty-five millimetres, which makes this the easiest OMEGA here to fit on a small wrist and is the strongest selling point the sheet contains.
- Check the lug width is the published 19 mm before sourcing a strap. Nineteen is a stocked but uncommon size and a buyer will assume twenty.
- Confirm the calibre is the 8806, which appears on no other OMEGA documented here and carries 55 hours rather than the 60 of the 89xx movements.
Sources
- OMEGA official product page for reference 220.92.43.22.99.001 (Seamaster Aqua Terra 150M Co-Axial Master Chronometer GMT Worldtimer 43 mm, titanium) - Between lugs: 21 mm; Lug-to-lug: 50.00 mm; Thickness: 14.12 mm; Case diameter: 43 mm; Case: Titanium; Dial color: Grey; Crystal: Domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides; Water resistance: 15 bar (150 metres / 500 feet); Total product weight (approx.): 94 g; Caliber: Omega 8938; Movement type: Self winding; Power reserve: 60 hours; Strap color: Black; Strap type: Rubber strap; Buckle type: Foldover clasp; Buckle material: Titanium — retrieved 2026-09-23
- OMEGA official product page for reference 235.10.38.20.06.001 (Seamaster Railmaster Co-Axial Master Chronometer 38 mm, steel) - Between lugs: 19 mm; Lug-to-lug: 44.92 mm; Thickness: 12.36 mm; Case diameter: 38 mm; Case: Steel; Dial color: Grey; Crystal: Domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides; Water resistance: 15 bar (150 metres / 500 feet); Total product weight (approx.): 136 g; Caliber: Omega 8806; Movement type: Self winding; Power reserve: 55 hours; Bracelet material: Steel; Type of Clasp: Foldover butterfly clasp with comfort setting — retrieved 2026-09-23
Not affiliated with OMEGA. Specifications are read from each manufacturer's own published documentation on the dates shown and may change; the manufacturer's current documentation governs.