Depends on the era it was produced, 1940-60 will have the last 2 numbers stamped, 61-80 use a code system starting with A-Y. The chart can be found at alloy artifacts under the Wright tool section. In 1981 they started stamping the last 2 digits again and that is true for current production also.
Morning, I have a Wright Deep Well Socket (3616) with a Diamond on it. I don't see a reference to this on Alloy Artifacts or anywhere else. Anyone have any thoughts on what year that's supposed to represent? TIA