The other black '80 I own, and the three '79 tanks I have out for re-painting all have the decal stripes in the "lower" position (there is no intersection with the top-stripe at the tank's forward edge). Here is a photo showing the "lower' stripe position common to all but my early '79 tank:

And here is a link to some more crappy photos I shot this morning - please note the captions which show-up below each selected photo:
http://www.fototime.com/inv/34AC32CE2B740B2
It appears to me that Honda may have performed a "running change" in early production and moved the tank stripes to the lower position - visually more attractive in my opinion. I did not notice this until I parked my two silver bikes side-by-side.
I would appreciate learning if other owners have noticed this. Where are the stripes applied on your 79/80 original paint jobs?
Thanks in advance and all the best,
John
San Jose, California