Perhaps 1970s - I think the different color arms style emerged then...and the stars definitely were influenced by the by Evil Knievel Harley era. But I could be wrong.
Jimmy J
(Please note: Legit checks I do in this forum should not be considered 100% conclusive; I'm simply giving a gut reaction based on the limited information provided.)
According to their website, they changed their name from American Motorcycle Assoc. to American Motorcyclist Assoc in 1976, so this shirt predates that change.
I agree with Jimmy- the stars on the sleeve look suggests an Evel Knievel influence, probably after 1972 when Evel famously jumped the Snake River Canyon!
But the bonus is that "champion" although it's the motor oil...not the knitwear will bring in lots of extra vintage loving traffic. I would sneak "harley" in there too, but I'm a jerk like that.
Jimmy J
(Please note: Legit checks I do in this forum should not be considered 100% conclusive; I'm simply giving a gut reaction based on the limited information provided.)
Thanks everyone! I got in touch with someone at the AMA Motorcycle Hall of Fame Museum and they said it's from '73. That was the year Champion sponsored the International Six Day Trials. It was also the first year the ISDT was held in the USA. Now I just gotta find out who #53 was and wether or not that shirt was retailed or if it belonged to #53. Thanks again for all your help!
haha awesome! i love the researching aspects of selling that kind of stuff. It's like a low budget Antique Roadshow. What do i win for my outstanding educated guess?