Grigoriev, drawing

[Konstantin]

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Seen in a private collection in a respectable lady figure Boris Grigoriev, "Portrait of a Girl" (1917) By all indications, the picture is authentic. Arguments painting belonged to her late husband lady. The lady herself told me that when she married in 1980, this picture of her husband was. However, the explanation of how she got it, some obscure. Type somewhere bought for the occasion. It is hard to imagine that in the Soviet era, when the situation was quite different, someone decided to copy the pattern. First, Grigoriev at the time was not promoted, and secondly if you really copy, the full picture, and certainly not the picture.
Placed in the drawing itself estampnuyu frame with metal rim (these were common in the Soviet Union.)
Imagine my surprise when I saw the picture on the website of the Russian Museum, the exhibition "Water color and drawing early. 20th century."
And the question is: How can this be? Where a copy, and where the original? (The lady is not exactly a copy, sign, code code. Yellowed paper - my intuition. That it is original, but it turns out. That the Russian Museum - a copy???)