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It could be someones initials, they did stuff like that all the time. I know of an A12 car that has SH.T inside the trunk lid, to let the next guy know he went to the bathroom. Got painted over but bled though. I opened up a door and the plastic that is behind the door pad had somebodies name written on it with the glue gun that was used to apply the glue.



In photos it looks like chalk, but in my car it looked like a China Marker. Unsure what it really is that allows one to paint over it and not have it separate or blister paint off.

Marks on my car appeared to be on the top surface

And yes, I have no doubt it's a mark from the factory . . . that likely means nothing, similar to when I carved my name in a tree as a kid to show I was there