Marble's 579: my latest Sod Buster like "work" knife

Would you believe it? There is finally a white smooth bone work knife "sodbuster" It is the latest "sodbuster" style knife in my collection. But before I talk about it, I take you on a tour of some of my other "sodbusters" knives. "Sod Buster" is a registered TM of W.R. Case & Son. As far as I can see "sodbuster" (one word) is not trademarked. Any way, I start talking about the Marbles at about the 5 minute mark.