I have a set of 1970 date code Goodyear G60-15 Polyglas tires I just listed on eBay. The tires were in dry storage for years and are in overall excellent shape for their age. https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/254575925785
Overall great shape for 50 years old. We’re you able to view the eBay ad? There are detailed pictures and description in the ad. If you have additional questions I’d be glad to answer them.