Is that one of those artillery versions with the long barrel and butt stock? I’d love to have one of those and a nice broom handle Mauser.
Luger #2 is a surviving test pistol in .45ACP that was used in the evaluation of the handgun for US adoption.
Luger #1 was reportedly destroyed in testing, but I don’t think it was ever confirmed.
Luger #2 sold for MILLIONS.