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			Hi-
 I do not have an exact answer but I have an A G Spalding Bros No A mask from the 1890s/1900s.  I believe it is an adult amateur style (B is youth).  It is 9 inches tall and a little less than 6 inches wide at the widest point.  I have others that are 10 inches tall of similar vintage.  My earliest one is 9 inches tall and of similar width.  I think they look awesome and are a relatively cheap way to get a really cool display item from the turn of the century.  I have attached pictures of my Spalding No A (marked on the leather strap) and my earliest one.
 
 Alan
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