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Thorsten,
One thing is the date when the studio session ocurred, and another is when the postcard was published. There was a timeline for that (see Lance's book)
Yet another thing is the date when someone signed the picture. J Jacobs could have signed many of his Sankes in the 60's wouldn't he?
#3 was hand signed by MvR on May 2, 1917.
However, the photo was taken in February along with #2 and #1.
George
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