Tom,
What a fantastic dagger this one turned out to be. Your pictures really do it justice as well. Certainly a very early piece with extensive hand enhancing, the wreath work is fantastic. I have owned a couple of early WKC 2nd's that did use a better quality base metal than is usually found on the later ones, but nothing with this level of enhancing. The head is vastly different to the typical WKC 2nd and I can see now why you think it could be a unique variation.

Great dagger !