looks like sombody tried to wrap a duco and then realized the heads would'nt fit. (a mistake I would have made if it werent for this forum)

http://cgi.ebay.com/Slingerland-Maple-Drum-Shell-12-x-8-Vintage-70s-Niles-/390287767565?pt=UK_Musical_Instruments_Drums_Percussions_MJ&hash=item5adef6b80d

the description says he's got 12,13,16,22 shells

...what a shame!