Leitz supplied lenses to many camera makers up to and including the 1920s, Nagel for one. It can be quite interesting to play with, for example, a 135 mm Hektor. Unscrewed from its barrel, this will cover 9 x 12 cm easily, which is what it was originally designed to do. I believe Leitz stopped supplying other makers when the Leica really took off in the early 1930s and they needed all their lens-making capacity for Leica lenses.
As others have said, a 105 lens will cover no larger than 6 x 9 cm. The ad says it fits a 4 x 5" camera, doesn't say anything about coverage!