I'm trying to educate myself on vintage Omegas. I found this on ebay. Please tell how far off I am on my assesment. https://www.ebay.com/itm/Museum-Tim...e=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649 The crown looks wrong. I don't think the naiads had signed crowns. The hands and dial look correct. I'm guessing the crystal was probably replaced at some point. It looks too pristine compared to the rest of the watch to me. The movement has lots of scratches and is missing one of the screws that holds it in the case, but otherwise it looks to be in okay shape and to be the correct movement. I'm not sure how to verify what the reference number is for Omegas this old, but if 2064 is the correct reference number, the picture in the omega data base does look correct: https://www.omegawatches.com/en-us/watch-omega-naiad-medicus-ck-2064 Best I can tell these are going for about $350 to $600 depending on condition. I would think this one would be on the lower end of that range, maybe $350 to $400, but I'm not sure what is considered "good condition" for a watch of this age. I'm trying to learn more than anything else. I doubt I will make an offer on it. I'm just try to use it as an example for myself and others to gain some insight.