Acquired a IHC 509 wrench today. As you can see it is not the Osborne oew s wrench. It is the one with the 13/16 square on one end. Does anyone know what it was used on ? The other ( 509's S shape oew) were used on Osborne equipment and I suspect this wrench was too but am looking for confirmation. Gil lists this wrench in his IHC wrench list and shows he has one of these but this wrench doesn't appear in his pictorial list nor do I find picture of it in Rathbone. Any info on usage appreciated.