CD 134 rim embossed OAKMAN PATd SEPT 13. 81. in a greenish aqua - almost mint - color (note: the d is underlined). This CD 134 was found on the Central of Georgia Railway telegraph line North of Macon, GA.

This picture shows a close-up of the patent date "Patd Sept 13. 81.". One can see how the embossing is located inside the rim rather than on the rim.