I think this is an original 14HP Crossley radiator cap, although I could be wrong.The thread diameter is 1-7/8" with a 20TPI.It's not perfect, however, it will come up well with a bit of work. The nickel will polish up OK. There has been a bolt put through the middle and would be better off replaced.Othe..
Wilmot Calormeter in fair condition for its age, have placed in hot water and it still works, £100 plus P+P for more details call Tony 07951 819786 Warwickshire.
An original bakelite radiator cap with brass thread insert. Internal diameter (thread) is 1.75 inches. Believed to be from an early Austin 7. Nice condition. Buyer pays shipping costs.