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davidcyclebackMy off the cuff guess is that the guy won a "Burke & Brace collection," which included a variety of years and types-- original 1930s Burkes to Brace reprints. If so, the collection may at some point have been purchased from Brace or his family.
Mastro knows the difference between an original Burke and a Rowe or Brace reprint, so I would assume the lot was described as having an assortment.