H.F.Bauer 10 1/2 new

 
H.F.Bauer 10 1/2 new

H.F.Bauer 10 1/2 new

Description

From the 1940ies, maybe even from the 1930ies, dates this visually appealing 10 12 ligne manual wind movement from the German manufacturer Hermann Friedrich Bauer from the surroundings of Pforzheim.

The new variant described here differs mainly in the shape of the gear bridge, which is simpler shaped than that of the old version.

It seems like Bauer experimented with different shapes of the gear bridge, because there’s also at least one other version known:

differently shaped gear bridge

differently shaped gear bridge

In this case, the movement can only be identified by the dial side setting lever spring as a Bauer 10 12 new.

base plate

base plate

The base place shows, that it’s possible to have a decentral seconds indication at 6 o’clock. In the center, there’s the directly driven minute wheel, which is not ruby-beared, just as the mainspring barrel. All other bearings are equipped with synthetic rubies, together with the escapement rubies a total of 15 - the common value in those times.

version with 7 jewels

version with 7 jewels

On the 7-jewels version, only the balance is ruby-beared.

gear train

gear train

The gear train is the standard of those days with rather large wheels and easy to service.

gear train, 7 jewels version

gear train, 7 jewels version

Of course, the seven jewel version is constructed in the same way.

side view of the gear train

side view of the gear train

The gear train of the Bauer 10 12 is standard and consists of a directly driven center minute wheel, the third wheel, the seconds wheel and the escapement wheel. The non shock-protected screw balance regulates that classical swiss pallet lever movement.

7 jewel version

7 jewel version

The effective length of the hairspring is adjusted by a long regulator arm, which makes it easier to adjust the excat beating rate of 18000 A/h.

Bauer 10 1/2 new: Dial side

Bauer 10 1/2 new: Dial side

On the dial side, you see the yoke windig system with its large clutch wheel. On top there’s a partially engraved minute scale, which allowed the adjustment of this movement without having a dial mounted. On older movements, this was pretty common.

seven jewels version

seven jewels version

Although it is not very clear to see, the angled shape of the setting lever spring is the main identification factor of the “new” version.

In the lab

The specimen shown here came with broken setting lever screw into the lab, otherwise its condition was pretty good, so no service was made, only the setting lever screw was replaced.

Timegrapher result

The mean variation of the rates is on a level you can expect from a 70 to 80 year old movement of better quality, which did not get a service for probably a long time and which was heavily used. The rather large beat error is not uncommon to older movements, since its adjustment was difficult and time consuming, but since the amplitude of the balance is good, it's not that critical.

horizontal positions
dial up +1 s/d 268° 3.5ms
dial down -24 s/d 323° 3.6ms
vertical positions
crown right (12 up) 0 s/d 241° 04.1ms
crown up (3 up) -168 s/d 226° 03.7ms
crown left (6 up) -70 s/d 215° 3.5ms
crown down (9 up) +30 s/d 217° 4.1ms

Technical data

Manufacturer:Bauer H.F.
Caliber:10 1/2 neu
Number of jewels:7/15
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:2 hole(s)
Features:s
Functions:hour, minute, decentral second
A/h:18000
Size:10 1/2''' (measured: 23,2mm)
Literature: Flume: 1947 27
Inventory number:17026,19029

Usage gallery

Nostra gents watch (7 Jewels)

Nostra gents watch (7 Jewels)

This movement in the 15 jewels version was donated by Rolf-Jürgen, and in the 7 jewels version in the “Nostra”-watch from Hans H. Hanebuth. Thank you very much for your kind support of the movement archive!