OK - a couple of my thoughts.
1. Sodia is a topnotch maker, a "Name", if you will. There's some value there.
2. Really nice shape. Screws unbuggered.
3. This is a drilling, which I'm sure you knew. To determine what the details on the gun are, we'd need to see ALL the markings, many of which are on the barrels. From what I've read, I've seen that 30-30 was a moderately popular cartridge in drillings made in the late pre-war period, and maybe post-war. The nice thing about having a 30-30 in a drilling is you are not limited to lever-action loads with roundnose bullets and can load any pointed bullet into it.
4. This is a left-handed gun. From cruising the internet, it seems to me that for every hundred German guns with the "baecke" cheekpieces set up for righties, there's one for lefties. That makes it simultaneously both a rarity and something that appeals to a thin market. FWIW, this is not a "true" left-handed gun as the triggers are set up for righties, but the mechanisms for drillings are complicated enough that I can see the makers passing on trying to make a "true" left-handed drilling action. All my doubles are set up for righties and I'm about as left-handed as they come, and it makes no difference to me which side the triggers are on.
5. Nice stick. And in excellent shape. Whether it was refinished, can't tell from the pictures.
6. As to the hole in the rib, it may be that some prior owner had Bubba drill a hole to put something into the rib other than the "factory" blade sight. I'll speculate a glow-bead or Raybar sight or something. You're better off without it, but at some point that hole will need to be closed off and cleaned up because it's an access point for water. It's a tricky place to solder or TIG because of heat control and the presence of the regulating block within an inch or so. Just for legalities' sake, be glad it wasn't an ivory bead there.
7. The leather pad may, or may not, be original to the gun. A lot of these drillings, particularly from higher-end makers, were bespoke. Still, it looks to me like it might be an after-market addition. The leather appears a little proud to the wood.
8. Need more pictures, particularly re the rear rifle sights. Also need to know whether it's the flip-up rear blade sight or what. I don't see any bases for claw mounts.
Overall a nice find. I'll wait on the experts to weigh in before I get around to throwing a dart at the price/value board, though I do have an idea.