Baumgartner 800

Baumgartner 800 | - The Movement Archive

Baumgartner 800


The Baumgartner 800 is a Roskopf-type pin lever movement with 5 jewels, an indirectly driven center second and a balance with lookalike screw imitations. Unlike later pin lever movements of Baumgartner, a lot of attention was put onto the looks.

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This pin lever movement was released before 1950 and is a Roskopf construction. This means, that the minute wheel is driven only on the dial side, indirectly by a coupled gear on top of the mainspring barrel. This construction allows a large mainspring barrel (even covering the center of the movement and more) and a large second wheel, thus eliminating one transmission step.

Baumgartner 800: Baumgartner 800 gears

Baumgartner 800 gears

The speciality of this movemen is its indirectly driven center second, which is connected by the outer gears of the third wheel with a transmission of almost one-to-one.

Baumgartner 800: side view of the gear works

side view of the gear works

Pretty funny is the balance wheel, which should look like a screw balance (at the time, screw balances were an indicator of a “better” watch): The “screws” are nothing but half-circles on the outer side of the balance ring:

Baumgartner 800: lookalike "screws"

lookalike "screws"

The technical use is zero, but its optical effect is great.

Baumgartner 800: balance wheel with ellipse

balance wheel with ellipse

Much more useful is a detail on the bottom of the balance: The ellipse is made of a synthetic ruby. This guarantees best possible force transmission to the pin lever and lowest possible friction - for a pin lever movement.

Baumgartner 800: main plate

main plate

You can spot the ruby balance bearing (top and bottom use two jewels each: One for the bearing and one for the cap) and the yoke winding system. This is all a good indicator of a “better” (and mostly older) pin lever movement.

Baumgartner 800: Baumgartner 800 dial side

Baumgartner 800 dial side

On the dial side, there’s the yoke winding system and the bearing of the lever with a U-shaped cutout. This cutout allowes the adjustment of the depthing of the pin lever - typical for a Roskopf movement.

Lab details

The movement shown here was resinified, when it entered the lab. It got a full revision with cleaning, oiling and regulating.

Timegrapher result

In the laying positions, the Baumgartner 800 performs very well, but in the hanging positions, it loses any precision, which indicates a now well balanced balance - probably the ruby ellipse is the cause here.
crown right (12 up)

crown right (12 up)

crown up (3 up)

crown up (3 up)

crown left (6 up)

crown left (6 up)

crown down (9 up)

crown down (9 up)

dial up

dial up

dial down

dial down

horizontal positions
dial up-8 s/d
dial down-+0 s/d
vertical positions
crown right (12 up).. s/d
crown up (3 up)+240 s/d
crown left (6 up)+270 s/d
crown down (9 up)... s/d
Timegrapher output

Technical data

Size:10 1/2'''
Number of jewels:5
Escapement:Pin lever
Balance types: Nickel anular balance
Shock protection(s): none
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
  • lever
  • escape wheel, seconds wheel, third wheel, mainspring barrel
  • center second pinion
Construction type:pillar construction
Winding mechanism:yoke winding system
  • SCI (indirect center seconds)
References: Flume: 1947 83

Usage gallery

Baumgartner 800: Gisa mens' watch

Gisa mens' watch