Images show the following: Cast Iron RH, Cast Iron LH. These are lift off hinges popular before 1865. Available in 3 x 3" and 4 x 4" sizes. Sold in sets of two lefts or two rights.
3" and 4" Colonial Cast Iron Barrel Hinges #373X.IRN
Heavy cast iron hinge for doors.
3 x 3" and 4 x 4" are availble.
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, it you will need to order left hand hinges.