My SHOM, and ALL the SHOMs I saw starts with 401 xxx.
Did you take the movement number, to be more precise on the date?
This is not a less appealing watch, this Ref 159, it is totally different from the one I suspect you're mentionning.
This Ref 159 has a lot of character, I really love this much less known piece.
A piece for a connoisseur.
Un Morceau de Choix.
Best, my friend;
Le Chef Vlad.