Do I have a six-toed cat?

When I adopted my dear ziggy I was told he was a "six-toed cat" or a Hemmingway cat. But he doesn't really have six claws. It's just that his innermost claw seems to have an extra joint. It looks like he's wearing boxing gloves. Cute. Is he a real "six-toe" or is it "hamburger feet." His front limbs are normal so I know he's not a "squitten." Have fun looking that one up. Pts. Pls.