I've been looking for a C-Case constellation from the 60's-70's and have mainly been looking for a 564 but have come across one in particular. It's been on my eyes for a few days and it looks like it has the original, not refinished dial and the body doesn't look like its been polished much at all. The price I got from the seller was $500, and from looking at historic prices for similar models on the forum that seems quite fair. Is there anything I should know in particular about this model vs the 564 C cases? I did read a while back that the 70s was a transition period for Omega in terms of how they made their movements but otherwise, I am not too well versed. Feedback on the watch itself would also be much appreciated too.