Dr.Herb, As I recall, all of these backframe HK marked 20 commerical DWMs were in the 2000i to 8000i range. This is probably not consecutive, as most 1920 Swiss and a few other contracts were also in this "i" block range. Since this was the first letter block of new commericals, after the numeric series topped out at 99,999 or there abouts, I believe that it was reserved for special contract orders, rather than general production. TH
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