Manton is of course a famous name ..... but by 1910, John & Joseph Manton were long gone and the gun is likely to be a 'trade' boxlock, probably made in Birmingham, but possibly Belgian. Chances are that its an 'inexpensive' base gun. Some Manton guns bear a Calcutta address as the firm (that owned the rights to the Manton name) was based there for a time.

Webley & Scott on the other hand are good sound guns, though joint pin wear can be a little harder than average to correct as the pin is fixed (I think).