Bobby Jones mentions different clubs by their names, instead of their numbers - which didn't come into use until after World War 2. A Mashie iron equates to a modern 4 iron, a Mashie a 5 iron, a Mashie Niblick is a 7 iron and a Niblick is like a 9 iron. About the only club names to have remained the same from Jone's time to the modern era is the driver and putter.
Vitaphone production reel #4793.