Thanks, Doc.
This VOH mark is really well struck so it is perhaps the initials of the gunsmith altering the calibre, if Volks Heer does not make sense.
Incidentally, this P08 really works like clockwork in spite of its age, and it is in such a nice condition (all matching - apart from magazine -, etc

that's really a pity it had to be altered from its original 9 Para specs to comply with regulations...I somettimes think we really live in a strange country!
On a separate subject, I have at last found a good magazne for my other P08 (a 1918 DWM, originally in 9 para, but converted to 7.65 para to comply with previous, older Italian firearms regulations forbidding ANY 9MM guns to civilians).
I tried a "Dry run" and wth the new Magazine the toggle remains open at last! .
I have cleaned and lubricated the gun thorougly (by the way what do you reccommend for lubrication of sliding parts: GUN OIL, VASELINE, or GRAPHITE GUN GREASE?).
I will now will try it again at the range with standard FIOCCHI 7.65, and see how it goes. If still it will not work properly I will try replacing of mainspring with a 7.65 spring (it seems that when the gun was converted the original 9mm type spring was left in place by the gunsmith!!)
What do you think about it?
Thanks again for your help and all the best from Italy!!!
Ciao!
Marco