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Baumgartner 800

Baumgartner 800Baumgartner 800

Description

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.

 

Construction

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 gearsBaumgartner 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.

side view of the gear worksside 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:

lookalike "screws"lookalike "screws"

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

balance wheel with ellipsebalance 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.

main platemain 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 dial sideBaumgartner 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.

 

 Technical data

ManufacturerBaumgartner
Caliber800
Number of jewels5
Escapementpin lever
BalanceNickel
Shock protection(s)none
Balance cock directioncounterclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Mainspring barrel
Center second pinion
Construction typepillar construction
Winding mechanismyoke
FeaturesSCI
FunctionsHour, minute, second
Beats per hour18000
Size101/2'''
Image in Flume Werksucher 1947 83
Baumgartner 800BaumgartnerBaumgartner80010 1/2'''Baumgartner 8005 Jewels, 10 1/2''', 18000 A/h, SCI
Factsheet

 

Lab details

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

Timegrapher output

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 rightcrown right crown topcrown top crown leftcrown left crown bottomcrown bottom 
dial topdial top dial bottomdial bottom 

vertical positions
12 up  .. seconds/day
3 up  +240 seconds/day
6 up  +270 seconds/day
9 up  ... seconds/day
horizontal positions
dial down  -+0 seconds/day
dial up  -8 seconds/day
timegrapher measurings
 

Usage gallery

Gisa mens' watchGisa mens' watch

 

Links