Hey Jon, I think Tin makes a lot of sense. It was used back then for toys and it has a slight magnetic attraction. I agree the 19th century look of the field would support an early date - logical the game would depict a field of that era. Certainly seems like there is support to conclude 1880s or earlier, if it is made of tin. If aluminum, more likely 1890s, but since aluminum exhibits no magnetism with a regular magnet, your guess of Tin makes sense.
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