The 84-year-old kept the vehicle in his basement, along with an anti-aircraft gun and a torpedo.
Lawyers in Germany are wrangling over how to deal with a pensioner who stored a World War Two tank, anti-aircraft gun and torpedo in his basement.
The items were removed from a house in the northern town of Heikendorf in 2015 with the help of the army.
Prosecutors and defence lawyers are now negotiating possible penalties, including a suspended sentence and a fine of up to €500,000 (£427,000).
The defendant, aged 84, must also find new homes for the monumental items.
At a court hearing on Monday in the city of Kiel, about 100km (60 miles) north of Hamburg, lawyers were trying to determine whether the man's military collection had violated Germany's War Weapons Control Act.