I will be a bit of a contrarian here... From very little seen on the blade it can be a quite active Soshu piece (not that many Muromachi smiths did such large nie patches in ji so that they are visible even out of polish), which sort of matches the signature Hiromitsu.
So in deep theory the transaction can be worthwhile if you are near a good polisher, so you'll end up with a signed Soshu tanto from about 1510 AD for 2700 polished... That sounds a little cheap. And Soshu works are generally hard to find. Even during Muromachi mainlines like Tsunahiro were not churning up blades en masse.
But it works if you actually see the item in hands and 100% convinced it will polished well (surprisingly these large nie patches can sometimes even survive saiha, so no warranty and the way dark shadow rises from nakago is a little bit worriesome) and nothing opens up (and with Soshu it can open up wide and quickly. These blades have as much stress as they can bear). And you don't mind spending time/money on it. In other words - you have significant experience, convinced you are right, and know you want to gamble on Soshu.
5 years ago I would have looked at the blade in hand, huggled for 1000-1300$ and likely take it up for a project. Soshu is great. This one looks like hitatsura.
Today, not that interested. Rather pay much more even for unsigned Tsunahiro (you are not supposed to buy those, but I am a fool, so can do whatever I want) but get exactly what I see rather than gambling on something that even in the best case can come up only 90% right.