gman, if you look again at the photos in your link the captions are above the photos, so it’s actually the intricately engraved key below that’s described as the pipe key, the one like yours is the caption above it.
Pipe keys (in UK) are those where the stem terminates at the bit end with a female hole or pipe,as opposed to a solid pin like your one has.
Pipe keys are more commonly called ‘barrel’ keys in USA.
Your key is very interesting, the cruciform section to the pin and the large bits almost forming a tunnel, also makes a change to see something with proper patina that hasn’t been cleaned up! Very nice.
