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Hi Bret, Welcome! yes it is unusual for the dial to not signed especially with 60s Omegas. Howerver I believe the dial is legit. Problem with the watch for me is that it lacks of character, unsigned dial and plain caseback, a very boring watch overall. If you like this type of case & lug, other than the Seamaster 600 that you mentioned, you should probably look out for the Deville line at this time period, something like reference 1477x, 165.020, 166.020,.. They are much more characteristic. Also keep an eye on eBay recommended thread. Hope this help and good luck with your hunting!