The caliber Bifora 2025 was the first inhouse lever movement of the german manufactury Bidlingmaier in Schwäbisch Gmünd. It probably was the first form lever movement ever made in Germany.
Its production started in 1928 and replaced the former swiss made form lever movement, Bidlingmaier used that time in their watches.
The cost efficient pillar construction is rather big with 8 3/4 x 12 lignes and, easy to see, made with punched marts, such as the base plate:
The punched base plate reminds a lot of simple movement constructions, which were common at that time especially in round shape.
In the specimen shown here, the bearings are just made of brass, no jewels, but there were also versions of that movement available, which had 15 jewels and so all bearings with rubies.
The gear train is a very conventional one with subseconds at "6" and mainspring barrel, which can be released, at 12 o'clock.
The not shock protected screw balance beats contemporarily slow with 18000 A/h and controls a swiss-type pallet lever movement.
On the dial side, there's a cost-efficient rocking bar winding system with the click mechanism on the inner side.
This movement was donated by Rudolf Jeromin. Thank you very much!