New to all this and need some help finding out info on a gun I have. It is a side by side with leaf engraving. On the main portion is has "Thomas Southgate" on each side, and between the barrels it states "Thomas Southgate 2 Burton Crescent London WC" Also, on the underside it has "986" How would I go about finding out info, history, and value of this? Does anybody have any tidbits they can add regarding these firearms? Any comments appreciated.