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Fig. 4

Pierce 861(AUT)

linear automatic
no manual wind
sub second

11.75''', Do= 26.7mm
H= 5.1mm
including space for the moving weight,
base movement: Dm=Do= 19.4mm
15 jewels
f = 18000 A/h
power reserve 39h

Balance staff U1684

Stem W2051

Mainspring / battery
Zf924, 1.35 x 7.0 x 0.08 x 220mm

1.28 x 0.60 / 0.18mm

Comments about the data

automatic with linearly sliding weight
Through the aperture in the automatic bridge the movement can be wound with a special key for service purpose.
later samples with beveled base plate and no separate slide bearing on the balance cock

Dead end
In the childhood of selfwinding almost everything was tried to wind a watch automatically. Most designs were dead ends, although this one was not bad: With a two stage gear, a kind of saw actuating the first wheel, and a click it is simpler than most rotor automatics. And 300 shaking cycles of the 5.8g heavy weight are enough for 24 hours running. A modern ETA 2824-2 needs 650 revolutions of the 3.4g rotor for 24 hours, and therefore can't guarantee more efficient winding. However, one may be concerned that the undamped strokes of the weight to the movement may loosen the screws on long term.

Example, year: signature; shock device
ca. 1940: Automatic, Made in Switzerland, 15 Jewels; Incabloc
manually added: Max Landau Co, Unadjusted, Fifteen

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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