It's an original Xpress from 1996-97. It came with the black alloy rear gearbox and carbon chassis plates as standard, but it has been fitted with later Xpress Junior plastic rear uprights. Battery straps are from Schumacher.
From 1998 the pro models had a red alloy motor mount with a bridge over the layshaft, and Junior versions had a plastic motor mount. Parts are interchangeable between them all, and some parts are still available as they are used in their latest mini chassis.