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davidcyclebackI beleive these were issued by Chicago photographer George Brace. Don't know who is Mac, but perhaps he was a partner in the deal. I don't recall when they were issued, but 1960s sounds reasonable. I don't beleive the year of issue is known for any of these types of Brace/Jim Rowe/other photos and photo postcards, and they may have been sold sold for more than one year. They were sold commercially, often via mail order, so are not unlike baseball cards.