You can date you gun right on the browning site here:
http://www.browning.com/customerservice/dategun/
index.asp
You can download manuals here:
http://www.browning.com/customerservice/ownersmanuals/
index.asp
I don't know brownings shotguns that well but I don't think "Special Steel" is enough to identify which model this is. Any idea on that age to possibly determine the model, over/under, pump?