Pink Pages
for Timepieces
All Items
Ranfft Items
Brand Shops
Commit an Item
How to do right
Condition of Watches
About Watches
  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

View picture in original size
Fig. 5

Poljot 2416 Kosmos

sweep second
date: set by changing 21:30-24h

10.75''', Dm= 24.0mm, Do= 24.6mm
rotor revolution circle D= 28.05mm
H= 4.55mm
F= 1.4mm
T= 2.0mm
29 jewels
f = 18000 A/h
power reserve 36h

Balance staff U3334

Stem W3224

Mainspring / battery
1.20 x 8.5 x 0.10 x 260mm

1.90 x 1.38 x 0.18mm

Comments about the data

low volume production, mainly for De Luxe models
option: date hand
detached manual wind
indirectly driven minute
space saving rocker direction inverter (Fig.4)
The self-winding gear is integrated in the movement, instead of attaching it to a manual-wind calibre as usual. Together with other design details, this led to a sensationally thin but still rugged movement at that time; only contemporary movements with micro rotor (e.g. Buren) were thinner.
Fig.5 shows the details:
The minute wheel A is not as usual placed in the center, where now only height is needed for seconds pinion and rotor post. Moreover it is driven by the barrel B over an intermediate wheel C, allowing to place it aside the barrel and not partially above.
Depending on the revolution direction of the rotor, the rocker wheels (Fig.4) drive either directly or via intermediate wheel D the ratchet wheel E (click not shown). Over the gear F and an intermediate wheel G the winding energy is transfered to the ratchet wheel H on the barrel B.
So the only purpose of the intermediate wheels C and G is to place train, self-winding assembly, and barrel in one layer without overlapping each other. So a low profile is achieved without concession to stability.
The ratchet wheel on the barrel consists of two gears over each other, coupled to the center section by hook levers. So the barrel can be wound independently by hand over the top gear, and automatically over the lower gear, via intermediate wheel G. This yields a softly operating manual winding, and reduces wear.

2415: -
2416: date

Example, year: signature; shock device
ca. 1970: 5942650, 29 Jewels; Poljot

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
phone +49 (0)4423 9849691

email: info@ranfft.de