I would like to determine the movement in this watch - unfortunately, in order to remove the caseback, you need a proprietary "star" shaped tool. This watch was available with both Cal 1345 (Lemania) and Felsa 4000. Wondering if there is any way to determine which - without removing the caseback. Possibly some telltale clue - maybe a unique characteristic like sound of the automatic winding mechanism, or a quirk in the time setting operations.