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> It is Pragotron PJ 27, 12V version. They have been produced in Czechoslovakia during 196x years and using the PS-1 mechanism.

What is the PS-1 mechanism?

Oldest electrilcal mechanism from pragotron, was produced in 195x-196x years, see https://f.aukro.cz/images/sk6961755962/c15a8263-ced4-4e31-a3... for the photo.