I recently obtained this item primarily because I was excited about the number of Cosmonaut signatures on it! I know that three of the signatures belong to Cosmonauts Valentina Tereshkova (first woman in space), Alexey Leonov (first EVA), and Vladislav Volkov (perished on Soyuz 11). Just having these three signatures on an item would be awesome, but there are still 17 others which I have yet to fully identify.
Looking at some exemplar signatures of some other Cosmonauts, I believe that Alexei Eliseev, Vladimir Shatalov, and Georgi Shonin may be three other Cosmonauts whose signatures appear on this item.
As for the other 14, I have no idea.
I would really appreciate any help that can be provided in identifying these other 14 signatures.
UPDATE
On November 12, 2016, I received an email from a new Russian friend in response to my above request for assistance in identifying the signatures on this item. My friend provided me with the below photo of my item, on which he identified all 19 Cosmonaut signatures!
Thank you Sergey!!!