http://www.singerco.com/support/serial_numbers.html for the date of manufacture and model using the serial number.
I don't have a FW, but I know they have the model number, which will be 221 or 222( more rare), on a little plate on the pillar. The serial number for more info will be around somewhere - probably underneath like the 301. That's the one used for dating. My 128 has a plate embedded in the bed with the serial number visible from the front of the machine, but no model number anywhere.
I think all FWs except the white one came in a black case. The white FW's case is aqua.