Vintage T-Shirt Forum & Community Authentication Appraisals

Got this from OG owner, it's single stitched on the hem and sleeves. I can't find any similar ones on eBay and the prices are all over the place. Reprints and Double stitched are selling for $100-$250, the Brockum ones seem to sell for $400ish but only the sleeves are single stitch. theres also no tag

There are all sorts of variants to this tee - some with more info on the copyright, some with none, but a brockum tag, or Giant tag. One is has a backstage pass logo.

With the value here it will mostly come down to the size, what's the pit to pit?