I suppose you could send it to NBTHK, if you wish to do so.
Looking at examples, you could make it fit Takada.
You find Masame in the Shinogi-ji
You find a mention of tight Ko-itame and Ko-mokume, aswell as O-hada, rather a mixed bag.
You find Ko-maru boshi
You find the same nakago
You find nioi deki and wide.
The minute i saw the hamon i thought Takada. Reminded me of a sword for sale a few years ago. Same irregular gunome/midare and choji, looked like it wanted to be Sukesada but the choji was different. It is written than Takada smiths were quite smitten with Sukesada and on occasion their work will fool folk into thinking Bizen. That sword was towards the end of the Muromachi though.
Also written that horimono is rarely seen and usually not the best.
Without researching more, the length of the blade to the nakago is a slight puzzle. It does look like katate-uchi but the longest i can remember in that bunch has a nagasa of around 67cm, i guess not too far away.
As for the blade shape, well, seen one too many exceptions to the rules.......... rule.
Anyways, just thoughts and nothing factual, be interesting to read what others have to say.