When I looked up the info on the treadle machine I got earlier in the summer the website said model 15K from factory in Scotland 10,000 in that run in December 1947. I'm wanting to get a manual for it and don't know which model 15 manual to order. They list 15-88, 15-89, 15-90, 15-91 and 15-30 as the possibilities.
How do I know which one to get?