So the previously believed fan jerseys get rid of the standard Georgia numbers. It's a bit different to celebrate 100 years on each sleeve rather than a patch on the chest but it works. Only issue with the 1980 throwback is the number font, but it was meant to be a regular block font by whomever made the uniforms at the time.
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Since you're dealing with tearaway type uniforms, I'm sure they may have had multiple number types during the year. Here's a home jersey from the same year.