FHF 12 1/2'''

FHF 12 1/2''' | 17jewels.info - The Movement Archive

FHF 12 1/2'''


As so often on cylinder movements up to the early 20th century, this 12 1/2 ligne movement, marked as “FOB 00”, cannot be identified, too. The only reference point is the early FHF hallmark below the barrel bridge:

FHF 12 1/2''': early FHF hallmark

early FHF hallmark

We have here a common cylinder movement of a good quality, which can be seen for example on the fact, that all important bearings, except minute wheel and mainspring barrel, contain rubies.
With three gears and the double (bearing and cap jewel) beared balance wheel, there’s a total of 10 jewels (10 Rubis).

FHF 12 1/2''': base plate

base plate

The gear train follows the usual construction of these kind of movements: Mainspring barrel, center minute wheel, third wheel, seconds wheel and cylinder wheel.

FHF 12 1/2''': gear train

gear train

There’s an odditiy on the mainspring barrel: To achieve an as eveny release of energy as possible, it’s core has got a so called maltese cross, which ensure, that the mainspring has got a certain base tension (limits the running time) on the one, and a maximal tension on the other side.

With this aid, a more or less constant power is possible.

FHF 12 1/2''': mainspring barrel with maltese cross

mainspring barrel with maltese cross

As balance, the usual three leg anular balance is used, which is of course not yet shock protected.
It beats with 18000 A/h and can be regulated with a long regulator arm.

FHF 12 1/2''': side view of the gear train

side view of the gear train

On the dial side, you see the yoke winding system with external switch at 11 o’clock, which is mostly set by a recessed pin the the case.

On the right, there’s the escapement block, which has got as a unit balance and cylinder wheel. However, on the dial side, the cylinder wheel is already beared under a cock, which is mounted on the base plate.

FHF 12 1/2''': FHF 12 1/2''': Dial side

FHF 12 1/2''': Dial side

You can see here the engraved number, 26792, probably an ongoing serial number, but maybe, it denotes a production date, 26.7.1892, which also plausible.

Usage gallery

FHF 12 1/2''': anonymous gents' watch, probably a reworked former pocket watch

anonymous gents' watch, probably a reworked former pocket watch

This movement and watch is a kind donation from Marco Bublitz to the movement archive. Thank you very much for your great support!