that's so great! Is there anyway you can get in touch with this knife collector for whom it was being sold?

You might also want to try and see if there's a cutlery museum or a sgian dubh museum somewhere. I have been trying to find info on German made piccolo and could find next to nothing on the maker (Otto Mönnig). Then as a last resort I posted something on a museum's forum. Turns out the museum was in Otto's home town! Here's hoping you have the same luck!