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Thank you very much ! Unfortunately I do live in Southend Japan and Shinsa is far away. I will think about the purchase and confront the seller if he has any other form of documentation.

On the Torokusho it says 72 (I assume cm?)

Interesting. Thank you very much! I assume a fake Tadayoshi, even from the Edo period, does not hold the same value, but does that mean its automatically worthless ? The vendor also added that a wavy hamon would be something only modern (or post Edo) blacksmiths are adding. That sounds a bit odd, right?

Hello and thank you for your knowledge in advance ! I am currently in Japan (and will be here for the next couple of months) and found an antique store with a couple of Katanas. Unfortunately, I do not have much knowledge when it comes to this topic. I heard that there are many 'cheap' and mass produced swords out there, so I am afraid I am holding one of these in my hand, and not an authentic edo-sword. The Kanji on the tang reads Tadayoshi 忠吉 Sorry, I didn't take as many pictures! The vendor is asking 260.000 Yen for this piece. Does this sound reasonable ? It comes in a Shirasaya only. Thank you very much for your help !