It's amazing discovery!!!. My best congratulations! It seems you've got a prototype of 130A camera indeed. It's very interesting to mention, that "Made in USSR" engravings on the frontplate were firstly used on early Sokol-2 cameras, i.e in 1977-1979, while your sample is from early 1973 ... Would be very happy to get a quality picture for my website, ok?
Congratulations Juhani!!! This is quite an amazing and interesting piece! It's amazing that you've found a super-rare version of a very rare camera, hold on to it, it's probably worth A LOT of money if it is in fact a prototype as Aidas says .