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.
1906 FIAT BREVETTI COUPÉ DE VILLE Coachwork by Carrozzeria Italiana Cesare Sala, Milan
1906 FIAT BREVETTI COUPÉ DE VILLE Coachwork by Carrozzeria Italiana Cesare Sala, Milan Chassis No. 788 Coachwork No. 5699 Location: Siena, Tuscany, I..