Very cool. Some guys having a discussion about those here. I’ve never seen one.
https://umgf.com/l-50-round-hole-or-is-it-more-gibson-oddities-t119849.html
Those frets are really worn down. If it was your uncles old Ferrari with original tires, would you leave them? Might as well get them replaced so it’s in top playing form but I understand the sentimentality.