Older 430 EX (not 430 EX II) with 6D
msowsun is correct. I have several flashes - one of which is an ancient 420EX (not II)! And it functions just fine.
The functions that don't exist are merely not selectable items - and that old flash has very little in the way of settings! But, the camera completely recognizes it and it works just fine.
Sometimes it's nice to have a smaller flash. So save your money and consider what you're going to want moving forward. You certainly aren't handicapped with your flash - it's a very good speedlite.
Enjoy your camera, it's amazing!
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