Thought this might be of interest. Some guys will already have a handle on it but I learned a bit myself.
http://www.historic-scotland.gov.uk/informguide-ironwork.pdf
http://www.historic-scotland.gov.uk/informguide-ironwork.pdf
Forty shillings for leaving the gate open at yours Brightspark
I dread to think how much you would charge to spend a penny.

here are a few pictures of some signs that i cast in our home made foundry.the 1st was made of a home made pattern. the second was cast using the original plate as pattern .they can be made in iron brass or aluminium melted down in a crucible in the furnace using coke and a blower for heat




