Markings on back strap of German HP

[pdstout]

Guys, has anyone herd of unit markings on the back strap of a WWII German Highpower? I know WWI P08s had them, but could WWII Pistols have them?
The markings look like the ones found on a German ID tag.
If I can get pitcures I will post them.
Thanks, P. Stout