I have a belt from an estate marked (1926 Rolls Royce). If I send a picture can someone help me make sure it is a fan belt. 20" long and made with what I think is ;rubber,outside,leather inside.
Whatever it is, probably isn't useable anymore.
You're asking about a very specific question about a rare collector car in a general car help forum, you may want to look into clubs for that vintage of Rolls Royces for help.