Looking at a display gun

I was looking at an old gun a member was wanting to sell as a display gun. It is from the 1880-early 1900's and I can't find a makers mark on it. The gun is chambered for a .577 Nitro Express. That is an elephant hunting size round. Most elephant guns are doubles and this is a single barrel with a double set trigger. I wouldn't be firing this but would display it. The member wnter $250. I looked on-line for this gun under several searches but see nothing like it. Any suggestions on more sites to check?

 

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