Keep the 1st, 2nd stage,LP hose and maybe the logbook. For nostalgic reasons frame them behind glass for on the wall in the man cave. It’ll make your Dad proud. After your dear Dad is gone. Give it another year and decide for yourself. But everything else that is rubber, neoprene, cloth, paper is up for the garbage today. Used AL80 scuba tanks are worth $17 med. grade alum. The brass is worth another $5. lb. Nothing last forever but the memories.