Are you sure this is a cal. 561 non-quick-set Ref. 168.007? The only Ref. 168.007 that I could find is this one, which looks totally different:
http://www.kaplans.se/en/auktioner/2185/vara/755560
View attachment 156945
The above watch dates from 1962, which is a bit before they started using the "OM" for gold dials. Something is telling me the example you're looking at could be one of the later C-cases with a cal. 1001 or 1011 movement. The dial certainly looks from that 1970's time period, but I really can't tell for sure.
Not enough information to make an informed decision.
gatorcpa
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