[Healeys] Factory body/ frame primer

[S and T Miller]

Hello all. I have noticed my BN2 has black factory primer (possible single stage paint that body color was painted over when assembled- much like eletro coat primer that repo parts have on them). All later cars (BN4 on) that I have had experience with had red oxide primer used from the factory.  Does anyone know was there a switch point? Were all 100's primered black? Were all cars eletro coated, and later cars primed with red oxide additionally? Was elctro coating even a thing back then? Just curious.
TY. Shawn

The Millers

"Always drive them, but remember each drive in an antique car is a test drive."
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