HomeRanfft
Watches
Pink Pages
for Timepieces
.
Home
All Items
Ranfft Items
Brand Shops
Commit an Item
How to do right
Condition of Watches
About Watches
Links
  Help   Log In  Register, Clients   Deutsch  English  EUR  US$  CHF  UKŁ 
 
 
 Index  Timepiece Archive, Categories  Archive: Watch Movements    Timepiece Market 
 
View picture in original size
Fig. 1

View picture in original size
Fig. 2

View picture in original size
Fig. 3

View picture in original size
Fig. 4

Pierce 861(AUT)

Features
linear automatic
no manual wind
sub second

Data
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

Hands
1.28 x 0.60 / 0.18mm

Comments about the data

Remarks
1933-
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


bidfun home
...the alternative - free of charge!
Dr. Roland Ranfft
Poststr. 32a
26388 Wilhelmshaven
Germany
phone +49 (0)4423 9849691

email: info@ranfft.de
.