natalia-v, I'm confused by all the old expert opinion on your work.. Almost all; after trials and attribution, for example, "Gorbatov" signed Petrov, and it was recognized Artconsulting (theme here
http://forum.artinvestment.ru/showth...82%D0%BE%D0%B2)
As far as I understood, for sale need fresh paper.
In the same AK told me that the documents are valid for 5 years after expiry everything is new..
This work is likely no doubt.. and the paper is very old; although I am no expert)
Thanks)