Original Apple, fully tested version 2 logic board for all PowerBook 1400 models. The processor is on the daughter/processor board, not the logic board. This second revision of the logic board is backwardly compatible with the v1 board but also supports the faster 166MHz processor board.
It 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.