At one point ford wrenches were abundand and cheap, but of decent quality. It is entirely reasonable that someone needed a wrench to turn something that had an obstruction and simply made their own variation ....
Many engines on other cars had weird head layouts requiring bent, twisted, curved and other strange shaped wrenches just to get the bolts out, but the bolts were , more often that not, about the same size as the ones Ford used.....
Perhaps it's really a Packard-Ford wrench -P