New, boxed, original Apple service spare 166MHz 603e microprocessor card for the PowerBook 1400 series. This part will only work on the version 2 logic board which can be identified by the numbers on the two ROM chips between the processor and RAM connectors. The version 2 board numbers are 341S0364 on ROM U3 and 341S0365 on ROM U4.
This was a sealed part which we have opened to test and ensure it still works.