First year 1967?

no stickers, considered permanent
can only be used on 'show cars' with limits on miles/year driven. Vehicle must be 30 years old.

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1967-???? (pairs issued through 1974)
 

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????-2008 black on yellow/cream
 

Previous version remains valid.

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2008-May 20, 2017
change to flat  ~8000 (black on yellow). All previous versions remain valid.
 

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May 22, 2017 - present

change to "standard design" ~16000. All previous versions remain valid.

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MOTORCYCLE

First year ????

"ZA" prefix
copper on black