Carol, what's the serial number on your FW? "221-1" would indicate that the features/way the machine is made is the first model of FW. For example, the faceplates on some of the FWs have a scroll, others have straight lines... I'm sure that if we put our machines side by side, we'd find more slight differences in the way they were put together (could be internal). That would be what the "1" after the "221" indicates.