Hi everyone, For sale is an uncommon **Omega Constellation ref. 14778-61 SC** — the desirable **“jumbo” 37mm** no-date Connie. This one is in very strong overall condition with a clean, original-looking dial and a freshly serviced **Cal. 551**. Service was completed in **Jan 2026**. No receipt, but I’m including plenty of movement photos and an up-to-date timegrapher result. **Key highlights** * Uncommon **37mm “jumbo”** Constellation (much larger than the typical 34mm of the era) * **Ref. 14778-61 SC**, gold-capped case with stainless caseback and observatory medallion * **Cal. 551** (chronometer-grade), freshly serviced **Jan 2026** * Great wrist presence; **19mm lug width** (another cool, uncommon detail) **Condition** **Dial:** Original sunburst dial in great condition. **Hands:** Flawless; matching black inlays pair nicely with the markers. **Case:** Gold-capped case. May have been polished previously. Light hairline scratches consistent with careful wear/age. **Crystal:** Original Omega plexiglas. There is a **small crack near the edge at 12 o’clock**. It does not affect readability and the rest of the crystal is in good condition, so I kept it. If the buyer prefers, I can replace it with a **new aftermarket crystal on request**. **Crown:** Appears to be a **service decagon crown**. **Caseback/Medallion:** Observatory medallion is in good condition. **Movement** * Omega **Cal. 551**, freshly serviced **Jan 2026** * Service included: **full disassembly, cleaning, oiling, reassembly, regulation, and new gasket** * **No parts were replaced** during service * Timegrapher (photo included): **+1 s/d, 255 amp, 0.2 ms beat error** (machine set to **49.0°** lift angle), **19,800 bph**