The Baumgartner (BFG) caliber 911 is modern built ladies' watch movement, which contains in the version with date indication a sophisticated date indication mechanism.
Its balance is secured in two KIF Protechoc systems (or without shock protection and with only one single bearing ruby) and contains a finger for the escapement. The escapement anchor in located in one jewel on the movement side; on the dial side, there's just a metal bearing. On this way, the unusual number of five jewels on the shock protected version is achieved.
The center second, if used, is driven directly; the minute wheel is located decentrally, which allowes a flatter construction and larger diameters for balance and mainspring. The hands are driven on the dial side by the mainspring.
The winding mechanism is a yoke winding mechanism, which is normally a feature of "better" movements, but the BFG 911 is in fact a "better" pin lever movement, too, which sometime even reminds of a anchor movement.
The date mechanism is unusually complicated, with gears, that contains teeths in different lengths, with springs and moveable jumpers. Because of this, the date switches semi-fast in only 45 minutes and can be corrected semi-fast, too, by turning back to 10:30pm.
This movement in the version without date and center second was donated by Klaus Brunnemer. Thank you very much!