gentalmen; most likely the internal marked grips were done , as they sold these to other makers who also made h.j. knives. remember , Solingen for the most part was a large co-op. many of the companies were Not capable of making all the items / all the pieces for an item. who knows, maybe they traded grips to another company for some thing they needed / did not make.
case in point; the wooden handels for sa/ss daggers, there was only 3 known machines that made them (No idea who owned them) but, tons of sa /ss makers. jeff h. (kool thread)