Kathy,
It looks to be a Singer Model 127; full size machine, bobbin winder up high . They are fairly easy to clean and lube if they have not got a 100 years or so of old gummed up oil in and under them.
Go here to date the machine: {
http://www.ismacs.net/singer_sewing_...-database.html }
Go here to get a free .pdf downloadable owners manual: {
http://www.singerco.com/accessories/instruction-manuals }
Bobbins are still available from Sew-Classic and I think Singer too. At least I've seen them in Singer blister packs.
Suggest Tri-Flow oil as it penetrates, cleans and lubes better than regular oil.
Joe