I believe it quite likely that Mendelsohn took the photos or paid to have them taken in contemplation of producing the m101-6 set. His ad in September 1917 claimed the pics had never been published before and many are dated to that year. 
As a publisher, it is possible he was also thinking about using the photos in a book or some other format, but given that he already had produced at least the m101-4/5 and E135ish sets in the preceding 18 months, he may have just intended to stick to "cards".
By the way, how do you know the pics are not of subjects from the m101-6 set? The top photo looks like Duffy Lewis to me, who is listed in some checklists for the set, although I do no recall seeing an m101-6 for him. Many collectors believe the checklist is incomplete, as more than the stated 100 have been confirmed.
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If we are to have another contest in the near future of our national existence, I predict that the dividing line will not be Mason and Dixon's but between patriotism and intelligence on the one side, and superstition, ambition and ignorance on the other.- Ulysses S. Grant, 18th US President.
Last edited by nolemmings; 10-20-2021 at 07:52 PM.
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