Quote:
Originally Posted by SetBuilder
There's also the felt-tipped marker pens that came out right around the same time as ball point pens in the 1960's. They produce lines that look like sharpies at first glance.

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Thank you for mentioning this. Many people seem to refer to any felt tip signature as a "Sharpie," but it's simply not true. The old water-based felt tip markers (Flair and others) have been in common use much longer than Sharpies.
This was signed with a felt tip pen in July 1969. It was not a Sharpie.