Unknown Luger - Seeking knowledge

[AMDO_Mark]

Greetings,

Thank you for having me. I come as a complete novice to Luger pistols seeking information on a family heirloom that belonged to my late Grandfather, a retired USN AOC type who likely picked subject pistol on one of many deployments.

Not knowing better, the engraved markings (alphanumeric characters spaced by periods) may indicate/identify unit markings... maybe a presentation piece modified pre WWII?

Enough speculation, just wanted to leave some pictures and ask if this pistol has identifying features you folks may be familiar with... thank you in advance!

// Updated 12/8/2022 - additional photos //