[flatfilefan]

"See ID" is also a signature if done own handed. I've seen a court decision to the effect that you can declare your signature anything you write. Important is if _you_ accept it as such later on.

[binarycrusader]

The importance is consistency and recognition as you point out.

But writing "See ID" on the back of the card and then using a completely different signature on the receipt is not acceptable as far as I know.