It doesn't strike me as a good shape for horses hooves but a couple of those might be handy to pick up baled stuff as well as a way to store wayward chimney sweeps between journeys up the next flue….
It may be a dockers hook but I can imagine it would be a bit dangerous with the sharp edges. Only ones I've seen were one piece bent -up rod. Might it be an ice hook- iceman deliveries?
I advocate a new forum rule …. any picture quizzes from now on must be accompanied by 'many' decent pictures of the object in question (from various angles).
BTW the handle is only big enough for two fingers. In view of the fact that the inside edge of the hook is flat I suspect it is really for putting through a loop in leather harness to pull it tight, or to pull up boots and then the screwdriver to adjust spurs, but then it finds other uses.