Here's one I'm especially proud to own.
Let's talk a little bit about Credit Card Knife (CCK) design. I feel comfortable talking about this because I collect CCKs. Here are a few out of my collection.
The end design of a CCK is greatly constrained by its intended function. It has to be approximately the same shape and size of a real credit card, be flat and have one or more sharp edges. Once you have a small flat rectangular piece of metal with a sharpened edge, there's not much left to do but improve the ergonomics and perhaps add a couple of additional functions, e.g., bottle opener, screwdriver, etc. The point is, they're all going to look pretty much the same.
Regarding ergonomics, which one of these do you think is going to be the comfortable and have the most secure grip?
That's why most of the CCKs produced in the last several years have fingerholes.
The better ones will also include beveled edges, thumb ramps and choils.
So, it's really hard to say that any one maker has an exclusive design or that one design unfairly copies another.
Some people appear to think that Mike Snody invented the CCK with his Crisis Card. Not so. At best he added a couple of unique features, which I'll get into in a moment. If credit (pun intended) were to go to anyone, I would vote for James Piorek. As best as I can tell, he first produced a version of a CCK years prior to Snody. It's a very basic version with no finger holes. Neil Blackwood produced one with finger holes before the Crisis Card.
Snody did add a couple of features which I think are really cool. They are, a notched straight edge and a toothed edge, sort of a comb with wickedly sharp tines.
But even that's been copied by at least one other maker.
Bottom line, DFK did not rip off Mike Snody or any other maker of CCKs.
I'm very pleased to own both of these.
GLC
Edit: I forgot to mention Daniel has a unique feature in his design. The small rectangles at the top of the card. They're there to aid in removing the CCK from a card slot in a billfold. Works, too.
