The german manufactury Hermann Becker (HB) of Pforzheim, was especially in the 1950ies famous for their water resistant watch cases, as well as for mens’ watch movements like the HB 115.
Among the few ladies’ watch movements, which are pretty rare and hard to find, there’s the caliber HB 675 described here, which has got a very special shape.Video on YouTube
It is a true pallet lever movement, which has got a slowly beating (18000 A/h) Glucydur screw balance, which is beared in two Super-Shock-Resist-bearings.
The construction is the same, as on other tiny ladies’ watch movements, with small and overlapping gears. Only the mainspring and balance are rather big because of the dimensions of the movement.
The shape of the movement it that, of a round 5 1⁄4 ligne movement, which is extended on the top and on the botton for more space for a larger balance wheel and mainspring barrel.
The specimen shown here has got the old shape of the setting lever spring.
In the lab
Timegrapher resultIn the horizontal positions, the movement performs rather well, but vertically, the rates are really bad.
|dial up||-30 s/d|
|dial down||+15 s/d|
|crown right (12 up)||-210 s/d|
|crown up (3 up)||-320 s/d|
|crown left (6 up)||-32 s/d|
|crown down (9 up)||-145 s/d|
|Number of jewels:||15|
Glucydur screw balance|
Super Shock Resist|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||4 hole(s)|
|Size:||5 1/4 x 8 3/4''' (measured: 15,1 x 19,8mm)|
Flume: 1952 33|