The Key Factor

I stumbled upon these old keys in a market full of discarded rusty objects piled in dusty bins in an obscure market in Udaipur, India. I almost walked past not wanting to attempt a foray into the mess, but the shop owner just kept smiling and gesturing for me to enter. I immediately saw the tray of keys and he quickly quipped, "These keys opened doors to very special things." I never got out of him exactly what those special things were, but I have chosen to believe him. The key is 1 1/2 inches long.