ROKUJURO

Wish you courage! It goes really fast, and you won't feel anything. As the doctor says: Don't be afraid, I've done this exact surgery already 60 times, so it will probably work out this time!

Looks like some kind of SANMAI TSUBA.

This one is in my family for almost 50 years:

Martin, looks like 21st century, and not made in Japan. Compare with real TSUBA!

Well, looking at this specific TSUBA with its crisp SUKASHI cut-outs, the almost 'virgin' NAKAGO-ANA, and the overall 'young' and almost unused appearance, I can understand the SHINSA assessment.

Jeff, there were no SAMURAI (or SAMURAI swords) in WWII.

Marcin, a TOGISHI is a blade sharpener/polisher.

TSUKA are generally items of wear and were replaced when necessary. It might not be impossible to find a fitting TSUKA, but chances are slim. It would not make sense to me buying 20 TSUKA just to find out that none really fits. In Japan, specialized craftsmen can adapt an "almost fitting" handle to an existing NAKAGO, but for security reasons this should not be done DIY by amateurs in case the sword was to be used (as in TAMESHIGIRI or IAIDO).

John, your TSUBA looks fine and authentic to me, but as 'TÔSHÔ' isn't a school but a style, it could have been made even in late EDO JIDAI. Looking only at photos and not at the 'real thing', I have the impression it might be a revival piece from SHINSHINTO era. Have you ever seen a new TSUBA? They are all patinated and never look 'new' in the sense of bare stainless metal. It is Japanese style to prefer a respectfully used (looking) item over a newly looking one. Patination is a kind of artificial corrosion, making an item look old while protecting it from deterioration.

Photo is upside-down. The length of the blade (as far as I can see just about 21 cm) is indeed that of a TANTO, however it is made in SHINOGI-ZUKURI style which is not common. It has nothing to do with military.

Just a guess: YOSHIMITSU? Mike, how long is the blade? It appears to have a SHINOGI so might not be a TANTO but a longer blade.

Not so unusual in my opinion. I think I saw it on HIGO TSUBA, and on TEIMEI (inverted INOME) as well: The surface on yours as well as the SHOAMI sample is not original to these TSUBA I think. There was a lot of corrosion eating away material. I am no expert on NOBUIE, but I don't see this design as typical for that school.

If it breaks after a blow, it will break there. So not recommended for battle use.

"ACHI" would not have been a possibility for a part of a swordsmith's name, in my opinion.

Probably a souvenir piece after WWII.