It could possibly be from a mix of parts from different vehicles, many museum aircraft are cannibalised from many sources/wrecks. I can't distinguish the underlying chassis, engine, drive train, etc. However the front half (engine cover, cab, mudguards) are right for a M5/M9/M17. The rear (cargo) block is right for a M16/M17 with the shallow folding upper side panels with cutout. I can't see the rear corners to see whether they are square or rounded, the main external difference between a M16 and M17. I would imagine it would be difficult to fit the bodywork of a M3/M16 to the chassis of a M5/M9/M17 and visa versa, never mind mix the front and rear bodywork.
While the USSR got the bulk (~1000) of the M17, the British got some. They also got large numbers (1000?) of the earlier M14 MGMC (like a M17 but only 2 x 0.5" MG). Due to the lack of air opposition and their shortage of APCs, the British converted many M14/M17s to APC form (M5). The '60s Airfix kit of the M3A1 with the panel and rivet line of the folding upper side panel represents such a conversion. The pictured vehicle could be one converted in wartime to APC from M14 or M17 then restored to a M17 MGMC.
US H/T lines:
White Motor Company:
M2/M2A1 - Scout/Command/Tractor H/T developed from M3 Scout Car
M3/M3A1 - M2 with slightly longer rear body with rear door as an APC
M13 - M3 with Maxon M33 twin .50 turret, folding upper side panels, half converted to M16 before being issued
M16 - M13 but with Maxon M45 quad .50 turret
M16A1 - Standard M3 with raised quad Maxon turret with "wing" turret armour
International Harvester Company:
M5/M5A1 - IHC version of M3/M3A1
M9/M9A1 - M5/M5A1 but internal arrangements to suit M2/M2A1 role
M14 - IHC version of M13, most went to British and converted to M5 APC standard
M17 - IHC version of M16, most sent to USSR
Overall it looks like a pretty faithful M17, whether always was a M17 or a M14/M17 converted to APC and restored back to M17 is another question.