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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

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Fig. 5

Pierce 134

manual-wind chronograph, 60s, 60min, pillar wheel
sub second

13''', Dm= 28.85mm; Do= 29.35mm
H= 7.0mm
F= 0.85mm
T= 2.2mm
7/17 jewels
f = 18000 A/h
power reserve 30h

Balance staff U1621

Stem W2046

Mainspring / battery
Zf1245, 1.50 x 10.5 x 0.12 x 320mm

2.35 x 1.48 x 0.35 / 0.35 x 0.21mm

Comments about the data

indirect minute
ratchet on dial side, crown mechanism with rocker bar

Patented axial clutch for second counter (Fig.3-5):
The minute wheel A is not in the center like in conventional movements. It drives the hands gears via canon pinion (Fig.2), and the third wheel B. This drives the sub second C and the detachable center second D.
On the center-second arbor with heart disc E and minute-counter driver F the pinion G with clutch H is running. Pushing (left in Fig.4) the arbor will clamp the clutch washer I beween F and H, and thus couples both together. The two points on H are then pressed into the soft washer I, thus reliably connecting both parts.
The clutch H is kept floating with springs J and K, and the spring L keeps the clutch parts apart. Coupled is by a lever (Fig.1, center) pressing on the center-second arbor. As the heights of all springs are adustable, the clutch can be sensitively adjusted to engage and disengage reliably without too much friction loss.
In most chronographs the clutch is realised by gears, and therefore the second counter jumps one tooth forth or back when started. This doesn't happen here, but there is a drawback in return: The original clutch washers I became brittle after some time, and replacement isn't available since long. But one can make them from suitable plastic material.

Example, year: signature; shock device
ca. 1945: Pierce Watch Co. Inc., Swiss, M, Patented, 17 Jewels

Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft

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