I think this is possibly a 14HP Crossley radiator cap.The Dia. is 1-7/8". It has a 20TPI thread.The bakelite part is excellent, the base has a nick to one edge, but it should still screw onto a radiator.I can post this and I accept PayPal.
Windscreen stored in the attic since around 1930. Some small rust and paint on the frame. Opening and screws are working fine.Price : Best offer + shiping