Alvin,
Your question engages a subject of some controversy.
First, I have no reports of any Alphabet Commercial Lugers with the serial number 10000letter.
Conventional wisdom has it that military Lugers, using the same numberletter system are numbered in lettered ranges of 10,000, numbered 1letter-9999letter. Some collectors point out that a ten-thousand gun range should be numbered 1letter-10000letter, there being no serial number 0letter. They refer to the one or two known reports of military Lugers actually having a serial number of 10000letter.
There is of course no answer for this; despite the odd report the suffix range (it projects an erroneous implication to speak of them as "blocks") is generally accepted to extend to 9999letter.
--Dwight
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