This WWI tank paper model is the Mark IV, this heavy tank papercraft is designed by landships. There are Mark IV B28 "Black Arrow" (Male tank) and Mark IV Generic two versions for this tank paper model.
The Mark IV was a British tank of the First World War. Introduced in 1917, it benefitted from significant developments on the first British tank, the intervening designs being small batches used for training. The major improvements were in armour, the re-siting of the fuel tank, and easier transportation. A total of 1,220 were built: 420 "Males", 595 "Females" and 205 Tank Tenders.
The Mark IV was first used in mid 1917 at the Battle of Messines Ridge. They remained in service to the end of the war.
The model includes two sets of tracks. The original tracks were only 20.5 inches (52cm) wide and were found to provide insufficient traction and high ground pressure. While the wider 26.5-inch (67cm) tracks were being developed, “spuds” were provided. These were track extensions that could be bolted to the narrow tracks every 4 or 5 track shoes. Photo evidence shows that exact spacing was not a matter of concern. The models include narrow tracks, wide tracks and spuds. [via landships]
You can download this WWI British Mark IV Heavy Tank paper model from here: World War I - British Mark IV Heavy Tank Paper Model Free Download