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Spring Bars for Omega

Speedmaster, Seamaster, Constellation, Aqua Terra. From 18 to 23 millimetres, 1.8mm factory pin.

Spring bars for Omega — Speedmaster, Seamaster, Constellation. Pin diameter and lug width as reference, verified in the atelier.

Technical glossary

1.8mm pin: the Omega spec few know about

Omega fits sport models with 1.8mm pin spring bars — same as the Rolex sport line. Speedmaster Professional, Seamaster Diver 300m, Planet Ocean, Aqua Terra: all 1.8mm pin. An aftermarket 1.5mm bar fits but bends within three months under a steel bracelet. My Omega Genuine Replacement bars come direct from Bienne — same factory replacement code as the brand itself.

Lug width 18 → 23mm: each Speedy is its own case

Speedmaster Professional 311.30.42 → 20mm. Speedmaster Reduced → 19mm. Vintage Speedmaster Mark II → 21mm. Speedmaster Date 3210 → 20mm. Seamaster Diver 300m 41mm → 20mm, Seamaster Diver 42mm → 20mm, Seamaster Diver 43.5mm → 21mm. Aqua Terra 38mm → 19mm, Aqua Terra 41mm → 20mm. Constellation 35mm → 23mm. Lugs are measured, not assumed.

Vintage Speedmaster cal. 321: coned lugs

Pre-1969 Speedmasters with calibre 321 and all 105.012, 145.012 references have coned lugs — narrower at the base. Nominal lug width is 20mm but actual contact width is 19mm. For those I use 1.5mm pin standard but with oversized sleeve. Same logic for the MoonShine Gold Speedmaster 310.60.42: bevelled lugs, 1.8mm pin, specific sleeve.

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Frequent questions

Speedmaster Moonwatch: 19mm vintage or 20mm modern?

Depends on caliber. Pre-1996 Speedmasters with caliber 321 and early 861 have 19mm cone-lugs. From caliber 1861 onward, lug is standard 20mm. Current Moonwatch 311.30.42 is precise 20mm. If unsure: serial number + Omega Vintage Database.

Omega 1.8mm pin: does it apply to whole catalog?

No. Sport models (Seamaster Diver, Planet Ocean, modern Speedmaster) use 1.8mm. Dress models (Constellation, De Ville, thin Aqua Terra) use 1.5mm. Vintage cone-lug 19mm requires 2.0mm. Generic Omega 20mm covers 90% of moderns — for thin dress 18mm get the dedicated 1.5mm.

Vintage Constellation Manhattan: drilled lugs?

Pie-Pan Constellations 60s-70s yes, drilled. Push from outside with a pointed tool, bar exits the lug without lateral case pressure. Post-1982 Manhattan (with griffes) are blind: traditional fork spring bar tool needed.

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