A breechloading cane gun with the pump attached.  The upper half of the gun conceals an air reservoir.  After unscrewing the upper and lower halves of the cane, the pump is threaded into the valve of the reservoir.  The same value serves as both intake and knock open exhaust valve.  The lower section contains the lock mechanism and rifled barrel.  There is a notch and bead sight.   I believe that this is made by John Blanch, London.