N-TBD: USA
8 1/2" X 5 1/5" (216mm X 140mm)
(embossed between outer skirt and first inner skirt) S-860 SPMCO
Picture courtesy John De Souza |
5 7/8" X 3 3/4" (149mm X 95mm)
No markings
Picture courtesy Rick Soller |
This was found on the NYNH&H electric railway from NYC to New Haven, Connecticut.