I saw a Sew-Rite M7 Salesman's Sample machine in an antique shop today. It was priced at $75 dollars and said it worked great. It is in clean condition. Does anybody know anything about these machines? What attracted me to it was the small size (less than 12" long) and clean condition. However, didn't want to take it home without asking the more knowledgable folks first. What do you all think? Should I drive back over there and buy it or leave it?