Please see below some images of a holster set for the early RIC.
This is the underside of the holster flap. Just visible a stamped '131' and a symbol like a spoked wheel. There are no other marks on the holster that I can find.
Two shots of the belt tongue behind the snake buckle. The maker is D Mason and Sons Ltd although this is indistinct because of creasing. I can find no date less a possible '07'. I have no idea what the 'KES' markings relate to.
Close up of the revolver. Please note this is a copy of the RIC, not a Webley made arm. This one was made in Belgium at about the same time. The top strap is marked BRITISH POLICE which is a model description rather than an indication of issue to a British Police force.