Below is a picture of the Luftwaffe Acceptance Stamp (LWaA2) just above the "1936" Date Stamp. These appear on the reverse side of the holster near the top edge (sorry - but I didn't want to fill the proof with "white" to clarify the picture, as I have no idea what it might do to either the proof stamping or the leather). The Acceptance Stamp is consistient with others found on HK proofed holsters.
Enjoy..!
http://www.p38forum.com/hk/36web/2.jpg