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From the Tamiya website:

 

The self-propelled heavy anti-tank gun Nashorn packed a formidable punch courtesy of a mammoth 71-caliber 8.8cm Pak43/1 gun which was one of the largest on the battlefield in WWII. The vehicle was developed in all possible haste after the German Army had the unexpected surprise of meeting such overpowering opponents as the T34 and KV-1 upon its invasion of the Soviet Union. The recently-developed III/IV vehicle was used as a base for the Pak43/1 gun, which was capable of destroying enemy tanks from great distance. Top road speed was 42km/h thanks to its relatively light weight of 24 tons. While deployment started in July 1943 under the moniker of Hornisse, it was given the new Nashorn designation from January of the next year, reportedly at the command of Hitler. 439 units were produced up to March 1945, and they served on both the Eastern and Western Fronts, providing heavy firepower for German forces.