I am not sure about the logo on the dial - looks a little darker and more irregular than it should - but I need a higher quality image to tell, for sure. The dial is very dirty, and the inner dial almost looks a bit molded. This is a cal 489, which was in the first memovox model, a manual wind alarm. The cal 815 and cal 825 housed models which are the first automatic winding alarms (825 with date) are more deairable and I think more the “classic” memovox; particularly the cal 825 in the 37mm case (ref e855) are considered the most iconic, at least in my opinion. That all being said, yours will need some work but I don’t think you overpaid.
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