One of my favorite haunts has several new old stock UltraBlades. The MaxiLock II and the MaxiLock III I believe. Possibly others. I keep passing them over for other items. I have looked at them closely though. They come in a plain white box and there is nothing to associate them with Buck, not even the box label. They were made in Japan. I don't think the term UltraBlade makes it a Buck. Only the provenance of who wholesaled it. The catch is I believe these knives were not exclusive to Buck and were imported and sold by others so there is no way to trace any particular knife as "Buck" related and must be collected as a standalone collection. I do happen to know the knives at this particular dealer sourced them from Buck and they are in the Buck display/sales cabinet. I may buy them someday If I hit a dry spell and in need of a fix. I would love to hear if any one knows differently as to wether these knives were exclusive to Buck. I don't think they were, but cant remember how I came to that conclusion. But if I'm wrong, I'm gonna take a road trip and snatch them up....;o)