For a very good representation of an early Messervier 4-reed one-row, see:
http://www.youtube.com/watch?v=yn8j20aO0Tc&feature=related This instrument is very typical of Messervier's early boxes. It has a red-painted wooden frame, a bellows divider, the blue"naugahide" plastic strips glued to the bellows frames. It's obviously very small and light for what it is (I'm assuming that it's a 4-reed - I've only seen boxes like this with 4-reeds but there may be others out there). Also, check out the "stops" -- they're "kitchen cabinet knobs" and obviously do not operate working slides.
The tune is "Hommage aux Musiciens" (which I believe is one of Messervier's tunes) and the player is Denis Cote.