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11-17-2003, 10:18 AM
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User
Join Date: Jun 2002
Location: San Mateo, California
Posts: 1,432
Thanks: 2
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I believe the C/N proof began to be used with later 1908 commerical production, superseeding "BUG" proofing, thus being much earlier than 1920. My 1908 commercial, #55055 has C/N proofs.
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