Randy
I bought a drilling that looked much like that in nearly the same condition at Jaquas for $800 about a year and a half ago. Mine is a Kettner (Ed I believe) made about 1920. It shoots great and I love it. I had wanted a drilling for years but never wanted to plunk the money. I bought this one since it was a good "play" guna and scratched an itch at a reasonable price.
I am not a drilling expert, but I looked for years and will mirror a few comments made here.
Modern calibers and hammerless drillings start at near the level you listed. Hammer drillings in odder calibers hardly ever get close to that range unless they are something really special, and I am talking ornate and pristine. (Yours honestly looks like it has a lot of "character". I have never been sure if this because of the caliber or the hammers. With the huge increase in interest in hammer doubles in general, I am inclined to believe the main driver is the caliber.
In general, I think a drilling like yours would be $750 to 1500, depending on the individual gun. A really nice hammer drilling in an older caliber would be 1500 to 2750. A modern plain hammerless in an available caliber would be 2800 to 4500 and a really fancy modern piece can go up to five figures (very rarely).
