A good site for saw info is
http://www.acresinternet.com/cscc.nsf/GasbyManufacturer?OpenView
All sorts of info for old saws.

If your saw is not covered on that site try;
http://www.arboristsite.com/
Post up some pics in the chainsaw secion and someone will be able to set you straight.

Or you could try googling pictures.