Hi, I've found this beautiful vintage Omega Speedmaster rose gold, which the shop said its from 1989. But i can not find anything about it on the internet or i just simply have no idea what and where to look for and it has an open back, where you can see movement. Im sorry. I forgot to take the picture of the back. Also if you know the current price of this one now. It'd be great, so i know how much i should bargain for! Thank you very much!
Can't tell you a whole lot based on one photo with the watchhead appearing to be wrapped in plastic. It looks like a 175.0033 but I'm guessing. This may help you get more information https://omegaforums.net/threads/vintage-omega-posting-guide.383/