This is the DH9 F.1258 in Museé de l`Air in Paris. This aircraft was built by Waring and Gillow Ltd. of London in 1918 and is considered the most authentic example of the type.
Lance says:
"Wonderfully evocative, unrestored plane in original and very good condition. Gray-painted plywood reveals grain pattern clearly, and rib tapes are very pronounced by the darkening effect of the old (dope?) Note many cutouts in fuselage undersurface, and brass magneto switches outboard of cockpits. Starboard wing root uncovered for visibility. Undercarriage struts gray steel. Control horns varnished wood.."
Two Shots of the engine area and one poor look at the cockpit.
These are pictures of the DH9a at Le Bourget, and are provided by Nigel Rayner and used with his permission.