What is ther point in someone sending spam e-mails that give another computer a virus? What do they gain from this? Do they get information from that computer or is it purely to annoy people and ruin their computer?

I found my grandmother's stamp collection, all of which contain stamps with English letters that I can at least type into google and find out where it is from.  Whilst this stamp appears to be Russian, from what I have researched online they all say C.C.C.P (U.S.S.R).

What other nation of this time has this writing? 

The top left says the price is 2CT if that helps?

 Even bette if you can tell me what the to words say...click picture to enlarge.

Thanks