Thank you. It pleases me to see inherited machines get back into their original purpose.
Yes, that is what is considered a 15 clone. There is also a C877.15 that is a Canadian Kenmore. There are lots of threads about 15-clones, on the board. The two threads I linked to should help. They are very good straight stitch machines.
A lot of us get our parts for our vintage machines from sew-classic.com I know she has belts, bobbins and wire on her site. It is generally recommended that one uses V-belts rather then round ones (except for the bobbin winder tire).
Enjoy
Janey - Neat people never make the exciting discoveries I do.