[Silver Fox Phil]

The Saddle tank is a locomotive that has its water tank wrapped over the boiler as opposed to being in a tender at the back of the engine. If you look at some of the industrial loco pictures in the gallery you will see some good examples. Cast iron plates are easily replicated even today by anyone with a small foundry.
Just another thought there were many plates made for steam traction engines too especially for the fair ground vehicles. Could be a number of things like that!
All the best
Phil