Another unusual 16 2/3 player would be the Seeburg 1000 which used 9 inch records with a 2 inch center hole:
http://en.wikipedia.org/wiki/Seeburg_1000
They show up once in a while on the 'bay... might be fun to collect. The programming is elevator music.
Streaming and info here:
http://www.seeburg1000.com/
jr