So if the name on the tang is only signed 肥前国忠次 (Hizen no Kuni Tadatsugu) is that the same as Hizen No Kuni Tadatsugu Saku (肥前国忠次作) aka Nakao Tadatsugu??
If so, I didn’t realize the Swordsmiths would sign tangs differently. .Just don’t want to get my hopes up if it’s not the same person. It appears that -“Nakao Tadatsugu was a decent swordsmith.