[RonC]

I would think the codes would be manufacturer specific not Ford unless it was a Ford part. The "O 8" is on an Auto-Lite manufactured part. Sometimes the "O" and "I" is omitted in the coding to avoid confusion with "0" and "1". Sometimes the coding is repeated after the year "z". ie A=1946.

By the way Auto-Lite date codes for Model A production are E - 1928; F - 1929;
G - 1930 and H - 1931. For months they used Jan - 1; Feb -2 etc. They did not use O, I, Q or V in any of their date codes. The "O 8" is not a date code on the breaker plate since "O" is not used. In addition they use "number" first then "letter".