"First Issue/Early Issue" is really a non-issue. The German production contract with DWM was not finalized until Dec, 3, 1908; and according to Sturgess the first delivery did not occur until March 1909.
So, if you really wanted to differentiate, "first issue" would be the undated 1909 deliveries, with characteristics as described above. Everything after that would be dated.
--Dwight
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