From a photo of Rev. 0 board 1070 (A2S1-0800), near location A1. SCM-25 9-77 date code. Frequency ?Total # on board: 1.
Part for my Rev 0 replica. SCM-18, 14318.18 KHz.SCM-25 is the case designation for plug-in, and SCM-18 is the case designation for wire leads.