That is a great find and you got it at my kinda price!!
I might have a manual for that particular buttonholer but I am goig to have to dig for it in my laptop. I have over 1000 manual in here plus that ones i am buying up so there is a strong chance I have it. I have seen only one other buttonholer like that before at a flea market but they were wanting $50 for it and I left it there.
Billy