+1 on the major auction houses.
Or else, If you really want to go through dealers I’d say go through people who have a (clean) reputation as vintage military watch specialists.
Brian Dumais, reachable on MWR, specializes exclusively in these and other Blancpain Fifty Fathoms- reachable on the military watch ressource forum. MWR.
Zaf Basha aka Classicwatch in Washington DC- reachable through his website.
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