* First & foremost: Welcome to the Forum!! I applaud you for a very detailed & helpful description of your Luger.
* Your example is termed a "1908 Commercial Model-Army" by Collectors. Long story short, it is a DWM (Deutsche Waffen-und Munitionsfabriken) manufactured Luger made late 1913 or in the first half of 1914 for the Commercial market. There are strong indications, by the markings on this pistol, it was impressed into service of the Imperial Army at the start of WWI.
- The triple Crown/X markings are Acceptance stamps of an Imperial Army Inspector assigned to the DWM plant in Berlin.
- The "Eagles" noted are likely the Army's Power Proof (Beschussadler) markings for the barrel, receiver, and breech link.
* The "11" numeral markings are the last two digits of the serial number of the pistol. Since the pistol was initially made for the Commercial market, these numerals will generally appear in a hidden location of the major small parts. I believe there are about 16-17 parts marked including some on the inside like the firing pin, trigger, grips, your added hold open, etc.
* The "8,84" is the actual bore (land to land)diameter in millimeters.
* The full five digit "69911" appears on one of the pistol's magazine. Assuming no other marks appear on the bright tin colored tube & wood base with this number, you have one original matching mag. The second mag originally belonged to an Erfurt produced Army Luger bearing S/N 6502a. The "+" indicated it was the reserve mag for this Erfurt pistol. The two Crown over Fraktur letter mag stamps are Erfurt arsenal assigned Inspector acceptance marks for the magazine.
* The Commercial DWM pistols started about 1899-1900 with S/N 1 and sequentially progressed up to your 69911 by 1914. As for the second mag, Army pistols were S/N'd in blocks of 10,000. The first block had no lower case suffix letter attached to the numeric portion of the S/N. The second block was the "a" block, third block was the "b" block and so on.
* The Holster (PT.08) was manufactured by A. Wunderlich Nachfolger in the southwest side of Berlin in 1914. It likely was mated with your pistol by the Army after the pistol left the DWM plant.
* The holster's "KR 6", "E K K 56", soldier's(?) rank/name, etc. potentially reveals a wealth of information on this pistol's probable use. I leave the further assignments this pistol served and in what period to those more familiar than I.
* Two very detailed posts appear under the "Imperial Lugers 1908-1918: P.08 Army Luger" section of the Forum. I'd urge you to read Jan Still's post of 12/29/03 entitled P08 DWM, Comm. Army R.I.R.72.M.G and J. Coe's post of 12/26/03 tiled A real commercial 1908 triple C/X Army.
* Once confirmed completely original and fully matching, the value is almost uniquely established by the amount of original finish, ie; Condition, Condition, Condition. Is it possible for you to post digital pictures or scans of this example and its accessories. This will aid Forum members in assessing your Luger & its possible market value.
* Again: Welcome aboard!