PNSSHOGUN

https://www.sho-shin.com/sag5.html Late Kamakura to Nanbokucho period.

Both are fine polishes, it's always difficult to say whether one is better than the other from photos. The second polish is perhaps better for a museum situation, whereas the original polish style can be enjoyed more in hand.

@Hoshi Yes the filter is great for options you want to see, being able to as easily exclude a dealer would be handy as well.

There were more than seven smiths, I suspect the seven usually cited in reference books are the smiths producing superior works and continuing forging traditions proper.

A small quality of life improvement for filters: currently all options need to ticked to then exclude any items/dealers you don't want to see. A simple show/don't show box would be welcome.

He can be contacted on Facebook.

The only vaguely standardised Kyu Gunto would be the arsenal blades, though even those had variations between makers and could be customised for length.

Really nice examples there, thank you for sharing.

The seller appears to have a vast amount of spare fittings and bare blades listed, wouldn't hold high hopes of anything being correct.

Are the mounts Navy, Army, or traditional?

Agree with Ian, this is clearly a WWII period made blade. The significant rust (likely from being submerged in water) gives a much older appearance.

Perhaps Owari Seki. Ideally photos of the full Sugata without Koshirae and clear shots of the Boshi on a neutral background would help.

That's a really great find and writeup, thank you for sharing. It isn't unknown for a general officer to still retain his field grade sword, Lt. Gen Baba's sword in the Australian War Memorial is a field grade cavalry Kyu Gunto with Shin Gunto general officers knot. From memory the black knot was authorised for use by all ranks in the field, the sword may have also been used by one of his sons? Did you have any details on how the sword came to the USA?

Dreadful fake:

Was this sword in military mountings? I understand quite a number of Japanese families emigrated to Brazil, it always amazes me where these swords show up.