Here is more detailed information:
http://molotok.ru/item413707846_roma...125h70_sm.html
This work sold for several years, then on kollektsioner.ru, it is still somewhere.'s No signature, although there is expert opinion.
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But similar work is in the cards
http://otkritka-reprodukzija.blogspo...g-post_04.html
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Probably the price too high ...