Dear Mervyn,
My family history starts before 1800 and from the Easton Cape. I also have the same John Hayton's revolver. The revolver was passed down to me from my father that got it from his father and so forth. My granddad told me that there were three Tranters made for John Hayton's gundealer in Graham's town. That is why his name was engraved on the bridge of the revolver. As for what I could traced was that I had one and the other one is in the Castle in Cape Town and that the third one was lost. This could be the one that you have found. Could you found more information on John Hayton? The military ones that was made did not have the engravings on it and might reach a amount of £1200 depending the condition of the revolver. The engraved ones are anything from £2000 to £3000 this is without a case and hearsay. Please let me know if you found out more on this revolver. Conrad