I have the NOS in box Tim refers to for the 47-53 style, see pictures. I have also included factory filmstrip pictures (1951) of the system. I have been debating if I was going to install mine and have now decided I will, should be a good conversation piece. Installed price in 1951 was $8.05 I paid $220.00!
http://good-times.webshots.com/photo/2883828370102454676ZfGtGx
http://good-times.webshots.com/photo/2941565550102454676kJTqbv
http://good-times.webshots.com/photo/2749685060102454676TSMHIq
http://good-times.webshots.com/photo/2704240040102454676fviFCT
http://good-times.webshots.com/photo/2428949040102454676eScfun
http://good-times.webshots.com/photo/2050953800102454676uIvfGh
http://good-times.webshots.com/photo/2325103400102454676WaCHCB