White greasepencil does a good job and is not corrosive. It can be removed completely with a clean toothbrush and lighter fluid or other non-corrosive solvent.
Anxiously awaiting your photos... I collect them.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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