Thanks to all responded! Artificial aging is hardly present. I'm in the late 80s worked in the literary Museum and for exposition we ordered copies of drawings. Artificially aged sheets've seen a lot, this sheet is not similar.
The picture was given to my husband in the 90's as a thank you for treatment, hardly anyone was interest his age. Something that's not Lebedev I guessed. I wonder whose style of painting looks like. But now the examination may cost? Judging by Your review, economic feasibility it not? Thanks again.
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