I have not seen that marking before.
Could it be an owner’s initials and a zip code?
It looks like 28304 is in the area of Fayetteville, NC. Any chance they came from there?
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Buying T205s: (larger want list here)
• Also WTB: Christy Mathewson - 1914 Pritchard Stamp
See the Want List for "Successful net54 transactions" list.
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