Check the price guide, it is in there. Search "Iron Man". That issue doesnt hold any significant value unless it is a very high quality copy. It can be worth several hundred dollars or more if it is high grade. If it's not super high grade it can range from being a $1 book to a $50 book, or around there.
And, just some info:
Golden Age is 1938-1955
Silver Age is 1956-1969
Bronze Age is 1970-1979
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