Transmission blue band?

This is probably in the nits and grits category but I want to get the engine and transmission on my 72 to their original colors. On my transmission it looks like the steel adapter plate (assembled you just see a 3/4" wide steel band) at the end of the transmission case has some faded blue on it. Does anyone know if it was originally painted the same Datsun blue as the engine block? As always, any help would be appreciated.