Mark, Nice pictures. Can you measure the length of the hose insulation on that hose were it goes under the core support?
I believe your hose was made by Goodyear "GY", with a date code of "0379" 37Th day of 69. How does that compare to your car build date?
One of my hoses was marked "P-7510" the type of ac hose, "USR" US Rubber bought buy UniRoyal, and "2-4-4-8" 244 day of 1968. That agrees with my build date. The fitting on the end was dated "2848"
Marty, I was cleaning & inspecting some other AC hoses and noticed small pin marks the length of the hose in a straight line. It may be from the manufacturing process of the hose. George