What does the key chains that F J Loudin invented look like and what were they made of?

F J Loudin actually patented a key fastener, it was recorded on Jan 9, 1894 and the device itself was made of several different types of metal.

You can actually view a copy of the original patent here:
https://www.google.com/patents/US512308?dq=ininventor:%22Fredrick+J.+Loudin%22&hl=en&sa=X&ei=TcToVNXVIcXQ7AaI_YGQBw&ved=0CCAQ6wEwAA