I have a very nicely refurbished Singer 7-31 for sale. This one has the retrofit reverse mechanism installed for pedal operated reverse. It also has a normal, yet monstrous, hand wheel installed which apparently turns it into a Singer 7-33 (the type plate still says 7-31, though) Everything works just like it should.  The Serial Number is AF-529180, which indicates it was born in 1940.  The head by itself is $1,600 if you pick it up in the Detroit Area. Do some Googling and you'll real