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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

Poljot 2415 Orbita

sweep second

10.75''', Dm= 24.0mm, Do= 24.6mm
rotor revolution circle D= 28.05mm
H= 3.9mm
F= 0.75mm
T= 1.35mm
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
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. 1965: 1331573, Cyrillic: 1st Moskow Watch Factory, 29 Kamnei (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.

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