That looks to be a very tidy, unmolested machine. They don't show up very often like that. Good aged patina.
Lucky you had a spare motor. Is the Camshaft solid?, it looks like it, and must have had a high load force to snap it.
Reminds me of Kohler 8hps where the hollow Camshaft breaks when it's hit by the Conrod.
Also, Good Vid work there 👍.