Here's are 30 flat keys on a metal ring (welded closed). There are also 6 square tags with numbers, leading me to believed these are from a hotel (or perhaps a prison), though I have no way to confirm. Keys are mostly the same type with a couple exceptions including one more ornate (skeleton?) key. All show a significant patina / wear from use. A couple are damaged (stems broken off).

The first 2 photos show the full lot. The remaining are to provide more detail. Feel free to ask any questions prior to purchase. These would make a fun prop, display item or collection for crafts.