For high-value pieces: tamper-resistant acrylic cases (the True Blue / BX sealed style) are the gold standard. For mid-tier: clear plastic tag protectors on the swing tag, displayed on open shelves out of direct sunlight. UV is the silent killer of red-bordered 4th-gen tags.
Doesn't have to be rare — just something you're excited about. Mint condition Pinchers from a thrift store, a sealed-case authenticated Maple, or that "ten for a dollar" lot at a yard sale. Show us!