Although FHF was primarily known for their round movements, they also had a number of form movements for ladies' watches in their program.
Amoung the earliest form movements is the 6 3/4 ligne caliber FHF 60, which was launched in the late 1940s and was later replaced by the million seller FHF 69.
Of course, all important bearings carrie rubies, which is important on movements of that tiny size to reduce friction and wear on the tiny axles.
The very compact gear train follows the classical construction with directly driven center minute wheel, followed by third wheel, seconds wheel and steel escape wheel. Third and fourth wheel have a very small diameter.
Since the escape wheel has got a rather large diameter, the bearing of the fourth wheel has to be on top of it.
As escapement, a swiss pallet lever escapement is used, which is regulated by a monometallic screw balance, beating wiht 18000 A/h.
The adjustment happens on the hairspring key directly.
Of course, the balance wheel is yet secured against shocks by two Incabloc shock protections.
On the dial side, you see the yoke winding system and a partial minute dial at 6 o’clock. It was used to have the possibility to adjust the un-cased movement.
In the lab
Timegrapher resultMost of the rates are pretty impressive, however there are two runaways, probably caused due to wear. This theory is also backed by the fact, that the vertical amplitured are significantly lower than those of the horizontal positions.
|dial up||+-0 s/d||295°||0.8ms|
|dial down||+-0 s/d||300°||0.5ms|
|crown right (12 up)||+20 s/d||234°||0.5ms|
|crown up (3 up)||+5 s/d||224°||1.1ms|
|crown left (6 up)||-6 s/d||240°||1.3ms|
|crown down (9 up)||+27 s/d||235°||0.5ms|
|Size:||6 3/4 x 8'''|
|Number of jewels:||17|
monometallic screw balance (two legs)|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Hairspring key|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||4 hole(s)|
Ebauches: 1949 I 24|
|Mentioning in literature (years):||1964|