Congratulations. You will love sewing with your new machine. FYI, there is a Featherweight Yahoo! group you might be interested in joining. Here are the links to several FW sites.
Serial Numbers:
http://www.singerco.com/support/serial_numbers.html
Parts / Supplies:
http://sewingmachine221sale.bizland....ore/index.html
I have never ordered anything from this site.
221 Parts:
http://www.221parts.com/
I have ordered from this site. Good service.
http://www.april1930s.com/
This is more about garment sewing, but she handles FW parts and accessories.
Graham Forsdyke:
http://www.singer-featherweight.com/index.html
Graham is located in England, and is one of the experts on FWs
Nova Montgomery:
http://www.novamontgomery.com/
Nova is located in Texas. I took a FW care and maintenance class from her.
Dave McCallum:
http://www.featherweight221.com/fwrx/index.html
Dave is located in Washington state. He has a comprehensive book and DVD with step by step care and maintenance instructions. I would recommend you getting one or both.
Glenn Williams:
http://pages.suddenlink.net/joyof301s/glenn.htm
I have never purchased anything from him, but his name is mentioned in the Yahoo group frequently as someone to go to.