I don't think it's a MkII blade Chris because the "blood groove" is much to large. Also most of the manufacturers of the MkII marked on their blades their company name. Even the guard marked knives had a stamp on the blade. This knife has no stamp. Chris you are right that it is very similar to the MkII blade. There were many knife companies that made blades similar to the MkII shaped blade. (Western, Marbles, etc.) This must be one. Also I believe they refer to these type of blades as "theatre made" knives.
Hope this helps.