ci dutch oven 12 inch

My brother-in-law gave me a 12" diameter x 4" deep cast iron, dutch oven for free. His brother bought it for scrap iron for $2. B.I.L. saved it and gave it to me. There are no marking on it at all. This is the same B.I.L. that gave me a 70 year old griswold dutch oven, a 4'x6' trailer for our...