Men's Omega 34mm Vintage 1950's Seamaster Calendar 14K Yellow Gold / Leather Band Watch. Pre-Owned Brand: Omega. Gender: Men's. Case Back: Solid. Condition: Good. Case Size: 34mm. Series: Seamaster. Case Shape: Round. Dial Color: Egg-Shell. Movement: Automatic. Watch Label: Swiss Made. Case Material: 14K Yellow Gold. Model Number: 2577/2520 SC. Bezel Material: 14K Yellow Gold. Band Type: Aftermarket Leather Band. Box / Certificate: Aftermarket Mahogany Box. Warranty: One (1) Year Limited Service Warranty. Service Date: Complete Overhaul Service on 05/27/2023. NOTE: The band on this Omega is an aftermarket leather band and not the original Omega band. We may be able to change the band upon your request. About Omega System Bumper - All 1950's Omega watches have a loud noise when shaken. The noise is from within the watch itself and has nothing to do with the working of the watch. This noise is normal for the era of the bumper system with regular automatic watches in the 1950's.