Baumgartner 911

 
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Baumgartner 911

Description

The Baumgartner (BFG) caliber 911 is modern built ladies’ watch movement, which contains in the version with date indication a mechanism for it.

version without shock protection

version without shock protection

The Baumgartner 911 does not use (or uses just a few) bearing jewels, depending on the demands.

base plate

base plate

The base plate tells you, that we have a pillar construction in Roskopf type: There’s no center minute wheel, since both hands (minute and hour) are driven on the dial side by a double clutch wheel on top of the mainspring barrel. This is the reason for the large cutout in the center of the base plate.

gear train

gear train

The gear train is, although it is a Roskopf construction, a modern one, the mainspring barrel drives (besides the hands on the dial side) the second wheel, followed by third wheel, center seconds wheel (which does not carry a center second hand on some versions) and the escapement wheel, into which the pin lever engages.

side view of the gear train

side view of the gear train

Its balance is secured in two KIF Protechoc systems (or without shock protection and with only one single cap 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. Other versions only have got one jewel in total.

The Baumgartner 911 already works with 21600 A/h, that’s more or the less the maximum, I’ve yet seen on a pin lever movement.

Detail: Ratchet

Detail: Ratchet

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 pallet lever movement.

The ratchet consists of a simple, geniously shaped spring, which is located below the ratchet wheel. A very efficient and cost-efficient construction.

double clutch wheel on the mainspring barrel

double clutch wheel on the mainspring barrel

The lower side of the mainspring barrel shows the Roskopf construction: A large wheel, which drives the minute hand and a small wheel to drive the hour hand are both mounted with a slipping clutch on the mainspring barrel.

Baumgartner 911 dial side

Baumgartner 911 dial side

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.

date mechanism

date mechanism

dial side of version without date and second indication

dial side of version without date and second indication

Technical data

Manufacturer:Baumgartner
Caliber:911
Number of jewels:1/5/17
Escapement:Pin lever
Balance types: Nickel anular balance
Shock protection(s): none
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, large driving wheel, mainspring barrel
Winding mechanism:yoke winding system
Setting lever spring:1 hole(s)
Features:(SCD,QG,RDR)
Functions:hour, minute, (second), (day)
A/h:21600
Size:8 1/2''' (measured: 19,2mm)
Inventory number:17052

Usage gallery

Royal Calendar ladies' watch

Royal Calendar ladies' watch

Geeta ladies' watch  (dial only)

Geeta ladies' watch (dial only)

Richard De Luxe ladies' watch

Richard De Luxe ladies' watch

Links

This movement in the version without date and center second was donated by Klaus Brunnemer and another one (together with the Richard ladies’ watch) is a donation by Günter G. Thank you very much!