This revolver is one of those built in the transitional period of Pepperbox to single barrel.  This example is non functional.  The side plate is a replacement and some of the action parts are not

Antique British Holster or Traveling pistol built by Henry Beckwith circa 1830.  This London maker ,born 1805, operated at various addresses from 1841 to 1868.  This example shows a 5 1/2" barrel o

A transitional revolver of about 45 caliber built or retailed by Charles Johnes, London circa 1830's .  These were a cross-over from the Pepperbox to the later revolvers including the Colt.  5 3/8"