PUW 500

PUW 500 | 17jewels.info - The Movement Archive

PUW 500


When the movement production of the Pforzheimer Uhrenrohwerke in Germany started in the 1930ies, the first ever made movement was a form movement with a size of 8 3/4 x 12 lignes, which (at least according to the Flume K1) had not yet an own caliber number. It was later named “PUW 500” and was produced for 25 years.

You can clearly recognize the old-fashioned construction with an escapement wheel cock and a small gear bridge, which houses only three gears.

The screw balance is of course not yet shock protected in the old version, but contains a long regulator arm for adjustment.

PUW 500: base plate

base plate

On the empty main plate, you see, that the available space is not fully used. There are large areas, which are not hollowed, on top right and bottom left. So many unused space…

PUW 500: Zifferblattseite


On the dial side, there’s nothing viewy. The yoke winding system, with its U-shaped setting lever spring (an indication for the early PUW 500) is clearly visible, as well, as the cap jewel and its long plate of the balance staff bearing (position “8”). At position “2”, there’s the old PUW punch.

Technical data

Size:8 3/4 x 12''' (measured: 19,4 x 24,0mm)
Number of jewels:15
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
  • lever
  • escape wheel
  • seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
  • s (decentral seconds)
References: Flume: 1947 135
Mentioning in literature (years): 1950