Big Game

Answer: No, the one-armed man is listed as "Mr. Löwenstein" and played by Polish actor Henryk Bista. He is a fictional character.

lionhead

Answer: According to an internet source, the one-armed man, Itzhak Stern, was real. Stern was a Polish Jew who worked for Oskar Schindler as an accountant and assisted in his rescue activities during the Holocaust. After the war, Stern moved to Israel.

raywest

Stern and the one-armed man are not the same person. The one-armed man, hired by Stern himself, dies during the movie, and Stern, as you wrote, survives.

Big Game