Ignat,
I also came across pictures with cut signatures. In particular Repin, which was then quite successfully attribution. I think in your case, all is not in vain.
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Сообщение от Ignat
1. if the leading experts A and B have spoken, whether the word change in the force of circumstances?
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Of course, experts say could change. There Petrov once said, and so far said in

This is a joke, I deeply respect him as an expert. So the initial opinion of experts about your picture yet does not mean anything.
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Сообщение от Ignat
2. Does it make sense to apply to other experts
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Of course there is! Hope dies last. You can apply in the Russian Museum in St. Petersburg, and in GosNIIR. And the same Peter ...
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Сообщение от Ignat
3. Can some technical espertiza give enough reliable result, and what it will cost?
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Maybe still in ArtKonsalting? The forum is their representative under the same nickname. I think it will help, and tell all prices.
And. I think that the expertise now need to give yourself, and not through the gallery owners.