Two additions:
> New Model Bulgarian - 500 to 800 shipped,
25 reported (only 13 not converted to 9mm)
> New Model Crossed Rifles ("Russian") - unknown number (<1000) configured as such -
36 reported (a few suspected fakes)
I would also include the P08 Bulgarians on the rarity list. The total count is just over 100, but most are refinished, rebarreled or mismatched.
Fewer than 50 seem to have all original parts and finish out of 6,500 to 10,000 shipped. This is perhaps the most "parted out" Luger in history.
Updated Counts:
> Old Model Bulgarian - 1000 shipped,
48 reported (at least 9 converted to 9mm)
> Unrelieved frame Old Models -
38 reported