doublegunshop.com - home Forums General Discussion Double Rifles, Paradox Guns & Gauge Rifles @ doublegunshop.com Help me identify more about my drilling

I apologize if you're reading this in duplicate. I posted this question on my other "favorite" shotgun site with the same questions. Hoping someone will provide a response.

What I have is a drilling that needs some authentication work. I’ll try to explain and type what I see from my notes. The goal of my inquiry is four fold:

1. I want to identify the drilling’s rifle caliber by deciphering the markings. (I will then cast / slug the bore to verify it is still within safe standards)
2. I want to decipher the maker’s name and learn about his workmanship and history
3. I’d like to know what the gun might be worth.
4. I’d like to understand what the receiver of the gun looked like the day it was made. I believe it was a combination of French grey and case coloring, perhaps browned in some manner? I may wish to restore the gun and I’d like to get it back to the way it ought to be.

Much thanks!

Part 1: MAIN RIFLE BARREL

Okay, so the barrels are 16 gauge X 16 gauge X “Mystery Rifle”. The 16 gauge barrels are 2 9/16” chambered and the barrels are marked Krupp Stahl and nitro proofed.

Under the center area of the barrel (on the rifle barrel specifically) are the following marks in order from top to bottom:

172.28 (Comment: I realize this is 8mm…but which one!)
--------
58

7.11
511 (Comment: small chance this is actually 311. I suspect this line and the one above are May-1911 and July-1911 manufacture dates for the components?)


Part 2: LEFT SHOTGUN BARREL (right one omitted)

I realize the encircled 16 is the gauge. Does the adjacent number indicate a choke specification? The print appears to say:

1,8gr CBP
-----------
STMG (comment a Crown over N is to the left of this line indicating Nitro I believe?)


Part 3: MAKER’S NAME FRAGMENT (Part of name destroyed by front claw mount installation)

The Maker’s name on the top rib appears to be as follows “C. LE** ***MBURG” The most likely third letter in the 2nd word is another E or an F. If I had to guess at the whole name I’d say it was made by “C. LEEsomethingernother, haMBURG”. (a wild fill-in-the-blank guess)

Part 4: FINISH

When I look under the forend the steel on the splinter forend appears to be case colored. When I look at the receiver most areas that look like rust actually look more like brown case coloring to me upon close inspection. Is it possible that the gun originally was case colored?