I would have no reason to doubt the authenticity: DuBois did not (at that time) use their own movements and Unitas were a decent but not terribly special make so there is no point in merging these two together post hoc.
Dubois is a very old Swiss company they say the oldest and they did make a range marked 1785 and that one certainly looks Ok no reason to think it is a replica of any kind i own an older Dubois Freres then there was Dubois & Fils SA, now they have started to market a new range (not cheap) as Dubois etfils. I have been told the name is pronounced - dup-wa
My older one no idea of the movement it as a top loader case
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