Good, you're o.k. for ammo then.
The little box lock pictured is a 20 bore ejector. I took a picture as I would have bought it but just didn't have the ready cash at the time.
I've had four hammer 12's in my time but sold them on. One was nice 32 inch barrels live pigeon trap gun. A friend once owned a nice side lock ejector. I wonder if they colour hardened their own guns as all the Wild's I have seen have had a particular dark plum colour not usually as deep on other guns from Birmingham. Lagopus.....