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Unread 02-11-2022, 01:58 PM   #4
Doubs
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G.T. is correct. Each suffix letter block begins with 1 and goes to 10,000. When 10000q was reached, the next block would begin with 1r. Therefore one, two and three digit serial numbers are legit.

In your case, once the z block ended at 10000z, the next block of 10000 would NOT have a suffix letter. The following block would begin with 1a ~ 10000a. IOW, each series through the alphabet began with a block of 10000 without a suffix letter.
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