Notes:
open face calibre
bimetallic screw balance
Breguet hairspring
lever and escape wheel anodized aluminium
Option: Reed's regulator (Fig.3)
early two-section regulator for coarse and fine adjustment (Fig.3)
steel bearing for stem (cf. Alpina 18" H6.3 open-face)
two-part crown wheel with big bearing (cf. Alpina 18" H6.3 open-face)
This detail is easy to recognise, because the crown-wheel screw head rotates during winding.
This screw is as else common left handed
Attention: The ratchet-wheel screw is also left handed
ebauche or even finished movement from Recta