70 number plate question

[oldtime3wheeler]

I just purchased a clean 79 atc 70. I came with a red number plate on it. I have seen them here and there, but not to frequently.Did certain years come with red instead of black ones? Or were they ones you could purchase seperatly from Honda?
Heres a pic of the plate on my trike.

[350Xccelerator]

Always wondered the same thing

[devilman]

scroll down on the link,

http://www.offroadvintage.com/page26.htm

[Troyg25]

I know this thread is old but the link is no longer avaible. Anyone have some info on the red?

78 79 only?