Frank, that sticker is from a 1921-30 MLB Die-Cut. They were part of a game and came as sheets of the players made from thick cardboard and a seperate thin paper sheet of the names and you pasted the appropriate "label" on the player it went with. They meticulously updated these every year to reflect the new lineups for the new year--many players have these that never made it onto a "real" card so they tend to be collected by player collectors without any alternatives. Here are some examples from a partial 1927 Cleveland team set I recently put up for sale.
http://cgi.ebay.com/1921-30-MLB-Die-...item1e60ded9a2
http://cgi.ebay.com/1921-30-MLB-Die-...item3cb427c651
Hope that helps.
-Rhett