Ron, welcome to the forum! Why do you think they ended up in Russian hands?
That said, the first thing is that dad's is obviously an import by the import stamping under the barrel, while both exhibit signs of reblue / dipping, which is common with russian or east german owned guns.
the #5 would be the serial number, and you can see that the toggle has been changed by having a different number on it.
Dads is proofed and accepted on the right, and is in the military manner of serial numbering.
Moms appears to be commerically proofed on the left although it is hard to tell, but is probably a crown N ??
Ed
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