Re: factory grease pencil marks?
That location and size is a bit unusual (as you probably already know).
My first guess would be a build sequence number (that's always my "go to" response) - lol.
Beyond that - it could be anything. I've seen scribbles dividing up lunch contributions, calculations for a bookie and love notes to the ladies in the Trim area, so there's really no telling.
K
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