For your consideration, here is a Vintage Rusty Rustic Small Clevis Hook, with Eye, marked D, 5/16, and 5..  It measures 4 inches long and 2 5/8 inches at the widest.  It has wear and some surface rust on it.  It will be mailed in a box, for protection.  Item pictured is the actual item for up for sale and comes from a non-smoking household.  (527.794q-.13b4)