Your first English gun. I say that as I suspect it may not be your last. Wm. Moore & Grey good makers with lots of information to go on. You don't mention what type; boxlock or sidelock, ejector or non-ejector as these will affect value as will condition engraving etc. As others ay it is difficult without a photo which you say you may be able to show soon. I won't try to access value as British values and U.S. values can be very different. Use it and enjoy it. Lagopus…..