That was my thought going into this but if you read the posts above, it appears there were several editions (for 1970 anyway)...a late '69, Jan15, Jan30, Mar, May, Nov...
Would like to have an orig manual but seems they're right up there w/hen's teeth, huh? If I'm going to pony-up the big bucks, would a 5/70 publication have come in a 5/70 build date? Or should I look for the previous edition? Thanks for the education. G