Vintage T-Shirt Forum & Community Authentication Appraisals

I recently found this shirt and am curious what time period it is from and the worth of it. I don't imagine it will be very valuable but I am trying to broaden my knowledge of pre 80s stuff. Knowledge is king after all
It is a shiny, somewhat heavy material, possibly a nylon/cotton mix. The company name on the back has been around since 1964 at the least. I included a close up of the material for your inspection. Any opinions would help. Thank you

Probably late 60s - nice silky smooth to the touch right? A pal of mine has bundles and bundles of those. Seem to be the original sport jerseys - for sponsored recreational teams. I think they are nylon - very weird to wear, typically very small. So aren't very popular. But there are a handful of them that feature old timey logos that do ok and some collectors scoop up. That one...not so much unfortunately.

Thank you again Mister J