this board seems to have number 4673. That does not fit into the mmyy scheme. Maybe Apple just numbered them sequentially before the s watched to the month/year scheme
Correct. The rev 0's are all numbered this way- looks like it extends possibly up to rev 4 release.
My Rev-01 Board is SN: 7294, but my Rev-03 is 7916.
I haven't check my various pictures, but I believe there is YYWW codes going back to the middle of 1978.. Which would be Later Rev-01 and the Rev-02 boards.