I too have loads of old keys many of them for cars long gone to that great scapheap in the sky. When I bought my 1966 MG special Kit car earlier this year, I discovered why they've gone more scientific with modern car keys as I have about 7 or 8 keys that fit the ignition, each one with a different serial number. I also have carburettor for a Dodge Ram circa 1994 and a BL Mini from about 1964. I love old keys especially the iron ones, and the ones with the hollow shaft.
Giok