The other concern is the brand of the machine, it does look like a Singer and while I don't have anything against old ones, I wouldn't buy a new one and if this is a Singer, it must be a newer one, since it has the drop in bobbins. posted earlier
Sorry, but age of the Singer cannot be determined by the drop in bobbin. There were treadles made with drop in bobbins, the "Treadle Lady" has tutes with one. It is from the early 1900's.