This machine is a compound feed and lockstitch machine that is used in making work shirts, overalls and raincoats. Clothing in general. It says that the compound feed means it has a needle feed as well as a drop feed. It has on the front of it a thread severing finger so you don't have to cut the thread yourself. it is similar to the 402 W and here's a link to the manual I found to tell you all about it. Hope it helps:
http://parts.singerco.com/IPinstManu...2W100_W101.pdf