Join Date: Jun 2007
Location: Cleveland, OH
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Mine is a Tartan 34 1985...not sure if it applies to classics but .....
When on the hard this year (our first) and starting to paint the hull I noticed a small dimple in the gelcoat (more like a6mm "outey") foe on the starboard and then one the stern. The marina had another 1985 T34 up for the season.....Ichecked her out ...same dimples. It seems that these were markers were meant to be the waterline marks for balancing.
As you can probably tell, I have little/no technical expertise and someone will probably post with the true nautical name of what these marks are, but perhaps it can help your investigation a bit.