I've been thinking about:
MY9THZ - because it is. I had MY6THZ years ago (300ZX) when IT was. There was quite a few people that would ask me if it really was (MY6THZ). I always wanted to answer, no, it's actually my third, I just like the number 6 more. But I didn't.
or
CCCLXX - 370 in Roman numerals. I had CCLXXX on a 280ZX years ago. It was fun to watch people in the rear-view mirror try to figure it out. Sometimes they got it.
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