HB 675

 
HB 675

HB 675

Description

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.

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Gears and trains

Gears and trains

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.

side view of the gears

side view of the gears

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.

main plate

main plate

The shape of the movement it that, of a round 5 14 ligne movement, which is extended on the top and on the botton for more space for a larger balance wheel and mainspring barrel.

dial side

dial side

The specimen shown here has got the old shape of the setting lever spring.

In the lab

On the specimen shown here, the main spring was broken and replaced (together with the mainspring barrel), and a revision (cleaning and oling) was made. The rest was at least visually OK.

Timegrapher result

In the horizontal positions, the movement performs rather well, but vertically, the rates are really bad.
crown right (12 up)

crown right (12 up)

crown up (3 up)

crown up (3 up)

crown left (6 up)

crown left (6 up)

crown down (9 up)

crown down (9 up)

dial up

dial up

dial down

dial down


horizontal positions
dial up-30 s/d
dial down+15 s/d
vertical positions
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
Timegrapher output

Technical data

Manufacturer:HB
Caliber:675
Number of jewels:15
Escapement:Pallet lever
Balance types: Glucydur screw balance
Shock protection(s): Super Shock Resist
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
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:4 hole(s)
Functions:hour, minute
A/h:18000
Size:5 1/4 x 8 3/4''' (measured: 15,1 x 19,8mm)
Literature: Flume: 1952 33

Usage gallery

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