PUW 660

 
PUW 660

PUW 660

Description

In the midst of the quartz crisis, 1977, the Pforzheimer Uhren-Rohwerke once again launched a large (11 12 ligne diameter) manual wind movement, which thanks to up-to-date manufactury and rational construction should be an alternative to the yet upcoming below-100-DM quartz watches. As known, the success was overdue, any only two years later, 1979, the complete manufactury of mechanical movements ceased.

The PUW 660 shown here is the bast movement of the fifth and final caliber family, which consisted of manual wind movements (calibers 660-664) and of selfwinding movements (calibers 1660-1664). The base construction is still the same as on the caliber family 260, which was launched in 1960.

base plate

base plate

On the base plate you can see the spave-saving construction with the large mainspring barrel. Interestingly, the slowest turning wheel, the mainspring barrel, is ruby-beared, but not the minute wheel.

The laterally mounted dial securing screws at 9:30 and 3:30 are one of the biggest differences to the predecessor PUW 560, as well, as the date quickset mechanism, for which there’s a recess at 9:15 for a diagonally sitting wheel.

minute wheel bridge

minute wheel bridge

Also on this movement, the minute wheel is directly driven by the mainspring barrel and it sits beyond an own bridge. For 1977, this probably wasn’t state of the art any more, but you still see the relationship to the first caliber family.

gear train

gear train

The gear train is the same same since 17 years: Mainspring barrel - minute wheel - third wheel - center second wheel - escapement wheel. It’s a very compact construction which wastes lots of space here.

side view of the gear train

side view of the gear train

The three-leg anular balance is beared in two shock protections (here Incabloc) and beats rather slow with 21600 A/h. For reference, an ETA 2824, which was launched in 1971, uses 28800 A/h, and in the early 70ies, there were several attempts of launching movements with 36000 A/h. In the age of forthcoming cheap quartz watches, a slow beat movement was conterproductive.

inside of the barrel bridge

inside of the barrel bridge

One of the biggest differences to the predecessor family 560 is, that the crown wheel is now located riveted under the winding bridge.

inside of the gear bridge

inside of the gear bridge

The ratchet remains on the inner side(!) of the gear train bridge, where you can also see the packed construction of the gear train.

PUW 660 dial side

PUW 660 dial side

On the dial side, there’s not much left from the predecessors. The large recesses are distinctive, they are probably made for the date indication and/or its quickset mechanism.

Unfortunately, the caliber family 660 is so rare, that it wasn’t possible to find a specimen with date mechanism for identification of the uses of the recesses.

In the lab

The specimen shown here came without case and in hardly used condition into the lab and hence did not get a service.

On the timegrapher, it ran fast between +11 and +32 seconds per day with an amplitude between 250 and 290 degrees.

Technical data

Manufacturer:PUW
Caliber:660
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
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:2 hole(s)
Features:SCD
Functions:hour, minute, second
A/h:21600
Size:11 1/2''' (measured: 25,6mm)
Production period:1977 - 1979
Inventory number:15020

Usage gallery

Anker 85 tails' watch  (without case)

Anker 85 tails' watch (without case)