is it an old railroad key? it's an odd one.

[GRAY GHOST]

hi all, here's an old brass key i found a few weeks ago in the old farm field i'd been hunting. handstamped, it says, "D.&H.C.CO." and on the other side has a brooklyn, ny. maker's mark [ can't make out the rest ] with another "S" handstamped. it's certainly an odd one. it's almost 2 and a half inches long. anybody have any ideas? thanks, and hh!

 

[brnn53]

It looks like a RR key to me. I could be wrong. Just ask my wife!
Mike