[Маруся]

Question to those who have encountered this problem. How, where, with the maximum reliability and, of course , it profitably spend in Moscow (preferably ... ) ?

There are graphics work supposedly the early twentieth century. Not that the sketch for the theatrical production of , and the 25th repeat or copy on a smaller scale - compared with working thumbnails are stored in the museum Bakhrushina . Art and other advice here for a couple of years give the same result: yes and no , or yes and no ( I mean : paper, condition , performance, - everything fits and there is no certainty )
And I just thought that once work is signed and inscribed ( the name of the setting and the author's name and initials ) - and all in the same handwriting , ink old regime and words written enough - maybe something handwriting analysis can confirm or deny ?