Juhani
You can see more about this lens at
http://www.photohistory.ru/1207248189184920.htmland
http://rangefinder.ru/club/viewtopic.php?t=3354 
translation of text
Both objectives were intended for the recording camera (RFK) " Selena", calculated for the frame 24x36 mm.
It appeared to me one of these miracle of technology!
Objective “Jupiter-38” (M42) 4/76, diaphragm 4-22, according to the scale - it possesses large depth of focus. Judging by the marks (on thelens) - BelOMO. It is possible using Pentax-K mount adapting transfering ring in M42 - It gives outstanding pictures.
The distance focusing goes up to no more than 10m (on Zenit cameras goes to 4.5m) the rear of objective begins to catch mirror and makes the focusing impossible (in large distances).
Although it is possible to evaluate through the hiperfocal.
In the "Jupiter -39" the focusing is completele normal. I.e. it is possible the use with SLRs,
This is interesting, the focusing ring and the diaphragm ring is built as on rangefinder cameras. I.e. the focusing ring is nearer to the pentaprism.
There are said that these objectives are collectible items now. They are part of the Recording camera of "RFK Selena". Produced to the police in the form of an encased set.
Probably so it is, because to from the familiar sign from the police to the written as needless items. By the way, judging by their conditions, no one used them since new.
Thus it is interesting, who knowa using similar objectives?. Are there any descriptive literature?
What for is such recording camera?
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" Everything, that leaves from under the hands of Japanese, be a broken knob or tape recorder, must be a work of art".
Konosuke Matsusita
Note : One can see a similar “Agfa Register Camera” at Mc Keown’s book.
Juhani - Can you confirm the Bolt letters?