There is a Nelson-Wiggen piano listed as a Style 7 on eBay, item number
261529449497.  I do not believe this instrument is a Style 7.  I have
included the only photograph I can find of a Style 7, from the first
edition of "Player Piano Treasury", by Harvey N. Roehl, page 118.  You
can judge for yourself.

Don Teach

 [ http://www.mmdigest.com/Attachments/14/07/12/140712_080530_N-W7.jpg
 
 [ Description by Harvey Roehl:
 [   "The particular piano which the lady is inspecting is considered
 [ by some authorities to be about the ultimate in the science of
 [ cramming lots of musical doodads into practically no space!
 [   "Originally located in Philadelphia, this piano was eventually
 [ 'found' and added to the collection of the late Richard Shattuck of
 [ Eldred, Pennsylvania.  When the picture was taken it was on display
 [ at the Musical Museum at Deansboro, New York; eventually it was
 [ sold to and became part of the William Allen collection in Santa
 [ Ana, California.
 [   "This machine contains the piano, a mandoline attachment, bass
 [ drum, snare drum, cymbal, tympani effect, tambourine, castanets,
 [ Indian block, xylophone, and triangle -- all in a space no larger
 [ than an ordinary upright piano!"