treadlep

Can anyone provide information about this sewing machine that has passed down in my family? Other than the "Richmond" name there is no other identifying information on the machine. Some of the paper with it seems to indicate that was sold through the Charles William Stores. I would like to know when it was made, what company manufactured it, and what type of needles it takes (they seem to be flat shank and longer than a normal needle). The needles with the machine are stamped B Eldredge. The belt that drives the treadle is actually a spring---any special care needed for that or any associated problems with a spring rather than a leather belt? It works fine and is in very good condition, so I hope to be able to clean it up and use it! Thanks for your help.