FHF 72-9

 
FHF 72-9

FHF 72-9

Description

Still using a screw balance is this, rather late windup movement from FHF, with a diameter of 11 1/2 lignes.

base plate

base plate

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.

base plate with minute wheel

base plate with minute wheel

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.

gear train

gear train

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.

side view of the gear train

side view of the gear train

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.

FHF 72-9: Incomplete dial side

FHF 72-9: Incomplete dial side

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

The specimen here came incomplete (parts of the calendar mechanism are missing) into the lab and got a simple spa treatment.

Timegrapher result

The 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.

horizontal positions
dial up +11 s/d 276° 0.1ms
dial down +12 s/d 253° 0.0ms
vertical positions
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

Technical data

Manufacturer:FHF
Caliber:72-9
Caliber base:FHF 72
Size:11 1/2''' (measured: 25,3mm)
Height:3,65mm
A/h:18000
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel screw balance (two legs)
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
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:
  • SCD (direct center seconds)
  • QG (date indication (aperture))
References: Flume: K3 39
Inventory number:20052
This movement is a kind donation from Horst Kull. Thank you very much for your great support of the movement archive!