I picked up a lady's Cleveland Welding Company, Royal Master, Roadmaster from the original owner who said it was given to her in 1950. Serial number is C61070 ACw. I've cleaned it up and was very gentle on the original paint. I need to clean the chain as it is thick with old crusty dry oil. It does not appear rusty. The oil has hardened almost to the consistency of a hard mud. What would you recommend? Another question is what the black metal loop is for under the headbadge? A headlight? If so what kind so I can start scouting around for a replacement? Next up will be seeing if I can get the tank horn to work again.