This item is a 1960s Omega Constellation. It is a chronometer. I had it overhauled a few years ago and have been storing it. It has a medallion on the case back. It is an antique automatic watch. It's a simple and lovely watch. I have also confirmed its operation, so you can use it with confidence right away (*^^*) With an Omega genuine buckle. How about using it for everyday wear? It's one of my favorite pieces. I am also listing many other items, so please take a look. Also, please note that I do not accept cancellations after purchase.