Possible early design for encapsulated stock mounting.

[spangy]

Originally Posted by lugerholsterrepair

Any idea what the two holes in the back of the frame are for??? (Are they tapped?)

I think you are looking at where the lanyard loop has been removed...

Yup ... lanyard loop holes

I think this is a Frankenluger ... a mixture of parts. JMHO

Being a 1917 slide I doubt it is an Artillery prototype Luger ... earliest known Artillery prototypes were 1912 - 1913
https://www.landofborchardt.com/pwluger.html
https://simpsonltd.com/dwm-luger-191...ery-prototype/

The frame seems to be modified at the stock lug with added metal welded to make a custom lug ... impressive work.

Ashampoo_Snap_2022.02.22_08h14m29s_032_.png