comments:
Before I get into my cut-and-paste spiel on vintage Omegas, to answer your question about buffing out scratches: you can use some Polywatch (see also this search) and old-fashioned elbow grease to buff out minor scratches in acrylic crystals. The following is my cut-and-paste response to people asking about their vintage Omegas (at the rate of dozens per day): Open the case (or have a professional do it for you). The inside of the caseback will have a reference/case identifier, and the movement's serial number and movement caliber will be engraved somewhere on the movement. See this item (specifically the 4th and last pictures) or the last picture in this post to see what I mean. A simple Google search for "vintage Omega lookup" will yield Omega's own vintage database and OmegaAddict's database, which are the two most comprehensive databases you will find. Note, however, that they are incomplete (and OmegaAddict often has site hosting issues). You can compare the serial number on the movement to the table in this article or run the serial number through this site to get an idea of year of movement manufacture.