posted 03-01-2016 11:04 AM
As you say there are very few cosmonaut autographs that command high prices (Gagarin, Leonov, Tereshkova, Komarov, Belyaev, Levchenko and a very few more) compared to earlier U.S. astronauts so the danger of fakes with those more common ones is not big though existent.I have been sent a three CD volume containing scans of fakes originating from Romania and Hungary once, so they are out there. Pretty often multi-signed covers are affected by these fakes, rarely single signed covers or portraits.
My own observation is that most of these Russian cosmonaut fakes are fairly easy to recognize, only a kid would draw like that, so with some experience you can easily spot.
This doesn't mean there are better fakes out there but again due to the lower value the danger is not that big.
There are some reputable online sellers on eBay as well (email me directly for names) where you can safely buy them.
I also carry some Russian autographs on my website and also on eBay under my ID "spaceflori" which were usually obtained through the mail by former East-German collectors thus are authentic as the Russian cosmonaut office did not carry an autopen machine or used secretaries to sign.