I'm saying that each of the models listed can have a serial number up to four digits (without letter suffix), in a series independent from each other. Each of the individual variations listed, regardless of manufacturer, could have a gun with serial number 641, for instance. (Not all of the variations had production above 1,000 units).
In order to uniquely identify a Luger, one must include:
Manufacturer/toggle mark
chamber date or other chamber mark (or blank)
frame serial number, with suffix--specify "ns" (no suffix) if one is not present
caliber
collector variation, if known
--Dwight
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