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Сообщение от Sergei burly; 1544611"

to maintain a pleasant conversation.

Agreed.

Сообщение от Sergei burly; 1544611"

So why do not attributed to its author, who is unlikely to be less well known than Vyalov

Because the seller - a relative Vyalov.

Сообщение от Sergei burly, 1544611

explains who the Vyalov Russian man - long and hard.

If a Russian wants to buy the painting with the signature of the author, he has to buy know who the author.

Сообщение от Sergei burly; 1544611"

titanic work, find an artist who worked
      in Semeize, and an appropriate style. Then he found his niece and how it
      to persuade her to work together - like here's the work of his uncle, was found by chance, sell.
     Yes, and criminal act (forgery of the signature

Well, this is a detective, Agatha Christie.
See more simply: a relative. among others, have a picture without a signature, may be K. Vyalov, maybe not.
Must sell. Signed sale easier, and adds cost. unsigned sell - harder, the buyer must explain something. Easier - sign ... (This is assuming that the seller actually a relative of the author, although the stock number is not home, a sort of)
Perhaps the author of the 1 st leaf, really, K. Vyalov. Second - almost exactly.
I would not get into this subject, if at the time had not seen in many works of his friend K. Vyalov
And, somehow seriously doubt that there is a certificate of examination THG for the job. Although, Katerina-m, obviously telling the truth, but could not forget a prescription ..