Hello, I have unused bound COPIES of Collins manuals- 51S-1- 15 May 1966, 75S-3B/3C- 6th Edition- 15 Jan 1974 $13 each incl postage to CONUS. I also have an original copy of the 312B-4 Manual- also $13 including postage. Tnx, Joel- AE2JL