Poljot 2616.2H

Description

The last iteration of the 26mm selfwinding movement with date indication from Poljot is the caliber Poljot 2612.2H, which was released in 1972. Its suffix “.2H” indicates the second relaunch of the 26mm caliber, and it doesn’t have many similarities and more with its predecessor.

It is very well executed, which is acknowledeged by great timegrapher results.

Of course, there are synthetic ruby bearings on all important gears, even on the minute wheel.

The central minute wheel is directly driven by the mainspring barrel and shows, that construction-wise no compromises and experiments were made.

Accordingly, the rest of the gear train offers no surprises, too: The minute wheel is followed by the third wheel, the center seconds wheel and the escape wheel.

The large, three-leg anular balance beats contemporarily semi-fast with 21600 A/h and is beared in two inhouse Poljot shock protections. You can assume, that it was also available with other shock protection system, because - typical for russian movement, there’s a flat brass spacer between the balance cock and the base plate to adjust the height-play of the balance.

The frequency of the balance can be regulated at the hairspring key directly, which is prolonged a bit for this purpose.

As escapement, a swiss pallet lever is used.

The selfwinding module is mounted on top of the gear train bridge, which has the required recessings.

The oscillating weight is effective in both directions, because the selfwinding mechanism uses a double pawl changer, on which only one of the pawl gears is driven by the rotor.

The crown wheel is driven after two reduction steps.

On manual winding, thje first pawl gear (the third one of the module, in total) of the last reduction step disengages the selfwinding mechanism.

The pawl gears are spring-less constructed.

It works in a way, that in one direction, the outer gear and the inner drive of a gear are connected, while it is disconnected, if rotated in a different direction.

The selfwinding module is mounted with three screws on the gear train bridge.

The Poljot 2616.2H uses an axle-beared oscillating weight…

… which is larger than the movement and overlaps it.

On the yet empty dial side, you can see the Poljot shock protection as well, as the rugged yoke winding system.

The Poljot 2616.2H has got an instantly switching date indication, which is realized with a date switching wheel with a cam and a switching lever.

The switching lever is held under tension, which makes it difficult to mount. Nevertheless, it is impressive to see, how simple that instantly switching mechanism is constructed. It consists of only three parts, of which one is a spring.

By turning the hands back to 8pm and forth to midnight, the date can be corrected semi-fast.

In the lab

Timegrapher result

If you see the heavily used and abused case of the Poljot gents watch, you would certainly not except a movement inside, which runs within the chronometer specs in all positions. That’s a really great performance!

Technical data

Usage gallery