Part Number: 1253-LEACH (Switch actuating) Part Number: 1253MH (Ne) Part Number: 1253MHZ (Ne) Part Number: 1253MHZDIP-14OSC (Factory original brand new) Part Number: 125-3NP-2 (Component) Part Number: 125-3NP-2G (Ne) Part Number: 1253-ON (Ne) Part Number: 125-3P (Spacer) Part Number: 12-53P1 (Connector & related) Part Number: 12-53P1YC (Connector & related) Part Number: 12-53P2 (Shell) Part Number: 12-53P3 (Connector & related) Part Number: 1253PF500VDC1 (Ne) Part Number: 1253R (No description)