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davidcyclebackMastro has a few auctions a year, so you could consign it their next auction. Also, you could try Lelands, as they auction a lot of photos.
If the auction house or potential is unfamiliar with the photos, mention that these photos were in the Halper Auction/Catalog, where Sotheby's assigned the date and said they believed they were for the anniversary, and were also auctioned in a REA auction. In the other thread on these photos, I listed the Halper auction lot # and the catalog has a picture of them.