This post shows an unique CD 134 Rim Embossing Oakman style insulator. The CD 134 Oakman is embossed as follows:

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.