Another Cubs Mystery Item

[smitti8]

I came across some more unusual Cubbie pictures. (Thanks again to all of the board members who helped me identify the 1904 Cubs spring training pics!!) This time player identification isn't the issue, it's the item itself that has me stumped...Hoping to get your opinions on just exactly what this may be ??

The players appear to be the entire pitching staff of the 1937 squad and one rookie back up catcher (Bottarini). The board itself measures 17.5" x 17.5" and is 1/16" thick. Each black circle measures 5.375" dia, and the photos are real & glued on. In some cases the photograph wasn't large enough to fill the full smaller circle diameter so the rest was airbrushed in (e.g. Bottarini, Lee, Shoun near shoulders) and I also noticed that both French & Bottarini had the cap "C"s hand painted on. Finally, their last name tags are cut outs that have been glued onto the photographs. Aside from each name written in pencil next to the circles there are a couple of curious numbers scribbled in the lower left and on the back. Sooo, what could it be ? A proof ? An kids art project ? A Cub coaching dart board used to pick the next pitcher ? Really value this boards opinions and welcome any questions to help determine a best guess !! THX, JB