Vern,
I think the "1902" is a typo as you say and should probably read as "1920".
Lots of DWM-parts guns were coming out of Germany in the 1920's.
Also, USA outfits such as Pacific Arms from SF, CA would give a luger buyer any barrel configuration you wanted in the 1920's.
Least remote but still a possibility...sometimes book authors rely on photos supplied by other collectors and dealers. It is remotely possible the gun in the photo is a 'boosted" gun and the author missed it in his edit of photo materials.
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