HB 313
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| HB 313 |
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Description
At the beginning of the 60ies, the movement manufactury Hermann Becker of Pforzheim, Germany
released their last selfwinding movement, the caliber 313, called "Ultramatic".
The HB 313 is a 11 1/2 ligne selfwinding movement whose rotor winds in both directions with
a rocking bar winding system. It contains a contemporary two-leg ring balance, which is beared
in two Antichoc S65 (or Rufa-Anti-Shock on the movement side) shock protection systems.
The hairspring is connected to a moveable stud
and can be regulated by a short regulator arm.
The selfwinding mechanism features a rocking bar changer, which drives the crown wheel via a
friction clutch. This clutch decouples the selfwindig mechanism when the movement is manually
wound.
The 25 jewel movement has got a directly driven center second hand and on the dial side a
yoke winding mechanism and a number of cap jewels to reach the high nimber of 25 jewels.
The large date ring advances slowly and can be corrected semi-fast by turning the time back
and forth.
During its production time, the movement was changed a bit, the (probably) older version which
was marked with the old "HB" marking, had a massive balance cock.
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| movement view of the old version |
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| movement view without rotor |
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| movement view without rotor of the old version |
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| selfwinding mechanism |
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| without selfwinding mechanism, old version |
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| empty main plate, old version |
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| dial side view |
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| dial side view, old version |
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Technical data
| Manufacturer | HB |
| Caliber | 313 |
| Number of jewels | 25 |
| Escapement | Anchor with pallets |
| Balance | Nickel |
| Shock protection(s) | Antichoc S65,Rufa-Anti-Shock |
| Balance cock direction | clockwise |
| Hairspring stud | moveable |
| Regulator type | Hairspring key |
| Movement construction | Fork
Escapement wheel, Fourth wheel, Third wheel
Center wheel
Mainspring barrel |
| Features | SCD,QG,RDR,AUT |
| Functions | Hour, minute, second, day, selfwinding |
| Beats per hour | 18000 |
| Size | 111/2''' (measured: 25,4 mm) |
| Image in Flume Werksucher | K3 207 |
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| Factsheet |
Usage gallery
This movement in its old version was donated by Harald Hoeber.
Thank you very much!
