[COLOR=rgba(0, 0, 0, 0.701961)]Hi guys, a few years back I purchased a new old stock replacement movement to fit into an old Seamaster. It certainly looks genuine and perfect, but there is no serial number on it. Could someone please explain the absence of the number.[/COLOR]
Could be any of a number of reasons. Mismatched parts, replacement bridges w/o serial numbers or non-Omega made parts. I doubt you will ever get a real answer. See this thread on a similar subject, also involving a cal. 501 movement... http://omega.watchprosite.com/?show=forumpostf&fi=677&pi=3627806&ti=582786&s=0 Hope this helps, gatorcpa
Many thanks for the fast response gatorcpa. The information on the other site made very interesting reading, but unfortunately it just deepened the mystery. I'm going to give it a complete overhaul in the near future and see if I can find any clues hidden within.
Further deepening the mystery is the difference in indentions of the Omega symbol on the main plate and the one on the bridge. Main plate one looks like it's possibly engraved while the bridge symbol looks stamped.
Thank you for your input Mondodec. I've just had another very close study of the movement using a 10x loupe and the Omega marks are identical, and both look stamped. Most of the screws have some evidence showing that the movement has been apart. I'm starting to think that it has been assembled from Individual spare parts. Someone has told me that there would not be a serial number stamped on a replacement bridge.
Since you say it is a nos replacement mvt, wouldn't it be logical to have no serial number. I have seen Rolex replacement mvt without serial number.
That was always my thoughts, it would just have been nice to get official conformation. I have no intentions of selling the watch just now, but sometime down the line I probably will and I would like to be honest and confident of my description.