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David HanveyThe two boxers in the set are Jack Johnson and Billy Wells, who were meant to fight in 1911, but the fight was cancelled.
Johnson was the Heavyweight champion and an obvious inclusion within any boxing set of the day. Wells however wasn't a huge star. Wells never fought in Cuba, and didn't fight much outside of his home country of England. The nearest he ever got to Cuba was when he fought in the US 1912/13
In 1915 Johnson fought Willard in Cuba. If these cards were released in 1915, why then wouldn't you portray Johnson and Willard on the cards. It was a huge fight for it's day.
Only due to the former reason, i think these cards were issued prior to 1915, but I wasn't sure if a baseball expert has come up with another theory.