LEITZ TELYT R 16,8 / 400mm LEITZ WETZLAR GERMANY -2862368

LEITZ TELYT - R 1:6,8 / 400mm; LEITZ WETZLAR GERMANY -2862368. Lens case cover shows outside marks and another mark on side of lens.

I do not know anything about this lens. Previous owner used it said it was very good.