HB 313
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.
movement view of the old version
movement view without rotor
movement view without rotor of the old version
selfwinding mechanism
without selfwinding mechanism, old version
empty main plate, old version
HB 313 dial side
dial side view, old version
Technical data
| Manufacturer: | HB |
| Caliber: | 313 |
| Size: | 11 1/2''' (measured: 25,4mm) |
| A/h: | 18000 |
| lift angle: | 52° |
| Number of jewels: | 25 |
| Escapement: | Pallet lever |
| Balance types: |
Nickel anular balance |
| Shock protection(s): |
Antichoc S65 Rufa-Anti-Shock |
| Balance bearing / direction hairspring: | Clockwise |
| Moveable stud: | yes |
| Adjust mechanism: | Hairspring key |
| Construction: |
|
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 1 hole(s) |
| Features: |
|
| References: |
Flume: K3 207 |
| Mentioning in literature (years): | 1964 |
Usage gallery
Anker selfwinding divers' watch
Ordiam gents watch (dial only)
Links
* [Ranfft Uhren: HB 313](http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&HB_313)
This movement in its old version was donated by [Harald Hoeber](index.php?option=com_content&view=article&id=61:donated-movements-of-harald-hoeber&catid=10&lang=en-GB&Itemid=201). Thank you very much!