The Yard Hook/Yard Guard isn't the first time that the only thing differentiating two Bussekin knives has been the blade catch. Check out this pic of Idahoskunk's Uncle MoFo (top) and Mister MoFo (bottom) from BadMojo:
Wait a minute... that looks just like my Yardhook, except Satin finish and Micarta scales and OOOOOOH so pretty! Not that my Hook isn't pretty, but this one is puurty... *drool*
Sorry, thread hijack, you can have it back now, lol.