Took it apart and its build quality is better than I expected, missing some parts but I get it running now. The surface finish is quite basic as typical Lemania, but all parts are coded. winding gears are quite strong and it's a better design than Angelus (SF240 & SF130) IMO. The one I got has a very strange gear set near the stem/yoke which looks like a power reserve indicator.
Maybe the smaller version of this (32mm?) might a better movement than SF240 mechanically.






