The shadow of Mauna Kea can be seen rising on the very right side.
Since the US D7100 number comes after the initial number for the much smaller Japanese market, it makes some sense to "steal" some of the Japan numbers.
But also oddly, we’re now seeing that a lot of other country serial numbers don't tend to have a 0 as a second digit, which is another departure for Nikon.
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Note: Pictures of pre-Ai versions may be of Ai converted lenses.This page lists every Nikon lens version and sub-version I know of.Minor changes to internal mechanics, lens coating, engravings or electronics may not be listed.Serial number blocks are separated by a thin pale line.Initial production of a product was almost always a two-digit variant of that with the second digit being zero (e.g. In a few cases, Nikon has used digits outside a region when production exceeds 999,999 units (see Note in next paragraph, though).For each version up to four serial numbers are given: Start - Earliest - Latest - End.