I had a ring already from 2017. Had it equipped when I got this years ring added to my inventory and was able to equip it as well. Now I have both! Method leading up to this if it matters. Handed in 10th exchange, got a pie. Left to farm without getting ring. Came back before 4 hours was up, spammed npc chat. Got ring added to inventory. Clicked it and then empty ring slot in inventory to equip. (Double clicking rings to equip rarely works anyway so I never do it)