These are lift off hinges popular before 1865. Available in 4 x 4". Sold in sets of two lefts or two rights. Pictured is a left hand hinge.
4" Colonial Stainless Barrel Hinges #373X.IRN
Stainless with black powdercoat finish.
How do you know if you need L or R handed hinges?
Looking at the door as it opens towards you, if the hinges are on the right, you will need to order left hand hinges.