Geschützwagen Tiger
The Geschützwagen Tiger (G.W. Tiger) was a German self-propelled gun carrier of World War II that never saw service. It would have been able to carry either the 17cm Kanone K72 (Sf) or the short barrelled 21cm Mörser 18/1 which had the same mounting; with the former it would be known as Grille 17, the latter Grille 21.