Still using a screw balance is this, rather late windup movement from FHF, with a diameter of 11 1/2 lignes.
As to be expected from FHF, the execution is very well.
All important bearings contain rubies, on the dial side there’s even a cap jewel for the escape wheel bearing.
The classical gear train requires a central minute wheel, which is driven directly by the mainspring barrel. It is beared under a double screw locked cock with a ruby.
Also the rest of the gear train is the common standard of the time, although in the 1960s, movements with an indirectly driven minute wheel were already en vogue.
The center minute wheel drives the third wheel followed by center seconds wheel and finally the steel escape wheel.
The FHF 72-9 is probably one of the latest movements, which was available with a screw balance. This balance still beats slowly with 18000 A/h, but is of course shock protected in two Incabloc bearings.
Typical for later FHF movements was the regulation on the prolonged hairspring key.
On the dial side, there’s of course a yoke winding system.
The calendar mechanism, which is responsible for the suffix “-9”, is incomplete on the specimen shown here, and therefor cannot be described in detail.
In the lab
Timegrapher resultThe deviation rates of this, not always nicely treated movement are impressive. Less than 20 seconds difference over all six position and thanks to the moveable hairspring stud hardly any beat error.
|dial up||+11 s/d||276°||0.1ms|
|dial down||+12 s/d||253°||0.0ms|
|crown right (12 up)||-11 s/d||227°||0.3ms|
|crown up (3 up)||-5 s/d||229°||0.1ms|
|crown left (6 up)||-4 s/d||233°||0.2ms|
|crown down (9 up)||-6 s/d||229°||0.1ms|
|Caliber base:||FHF 72|
|Size:||11 1/2''' (measured: 25,3mm)|
|Number of jewels:||17|
Nickel screw balance (two legs)|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Hairspring key|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||2 hole(s)|
Flume: K3 39|