Bill, You've got it backwards. The first commericals after WW1 continued using the 5 digit serialization that ended in the 75xxx range in 1914. When the numbers approached 100K in 1923, they switch to the military Alpha numeric system @ 2000i block rather than going to a 6 digit serial. The Alphabet commericals starting "i" suffix block corresponded to where 92,000 commericals, starting in 1900, would have already been made. TH
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