Mechanically similar to the Mark IV, though armament and other features were like the Mark II, the “Dutchmen” were a 1936 commercial version. 40 vehicles were sold to the Netherlands. All 40 were taken over by the War Office in 1939 before export. All vehicles were used for training only by the British Army. The term “Dutchmen” or “Dutchman” was an unofficial moniker.
Though never used in service, in the event of a German invastion (Operation Sealion) they probably would have been used to help defend the country.
After a bit of internet research I believe it is an old SDD miniature. Not convinced totally, but other miniatures in the box it was in carry SDD codes.