I would say painted on that plug.
Actually, the standard oil pressure sender (non Rallye Dash) was on the engine when painted....and crudely masked off. Seen plenty of originals with some overspray on them.
I should have mentioned it before....but water pump and thermostat housing, where the rad hose slides on....usually gets masked too....but you wont see it once the hoses are installed.
The fuel pump boss on the block....I believe was masked as well.
There is something with the block drain plugs too....they need to be Hex....not square. Also, I have to check my pics/notes....one side my be painted and the other side not.
Now we are just splitting atoms....Lol!
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