Monogrammist "GS" - Male Nude - Late 19th Century

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I managed to pick up this nice study of a male nude a few nights ago for about thirty dollars from a seller in Europe. Unfortunately it is only monogrammed with the initials "GS" so it is anybody's guess as to who the artist is. The artist did a nice job on that foreshortened right arm. Still a nice late 19th century pencil drawing for not a lot of money.
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