Just to be sure what you have. The left side of the frame should have the US Property legend and the initials E.E.C. (E.E. Chapman) with the letter E on the trigger guard. The right side should have only "NO" and serial number.
If this is all correct, and even if the pistol is refinished, I think you could probably more than double your money pretty easily. These guns are darn rare and most collectors would want one as an example, even if it was refinished.