Dave I hate to tell you, this is one of the "patina" india knock offs. They are nice and look legit but aren't. See the Ebay seller below and look at their other listings. Sellers claim them to be vintage, but they all come from a place in india that gives them all unique rust and patina. Whilst I could be wrong, I have seen some pretty remarkable fakes.
https://www.ebay.com/itm/35766547099...Bk9SR8iMub_CZg