I recently saw a gendaito in gunto Type 98 mounts and it had the owners name written in ink on the brown side of the tassel...it was written in katakana...a Japanese name (forget what it was now) but strange to see it written in kana.
And yes, I notice all those things you mention. I have a gendaito by an unknown maker "Shigekuni"...(maybe a modern member of the Nanki line?). It is a very nice sword (Type 98 with silver habaki) and it was surrendered to the Aussies on Halmahera in 1945.
The chap who apparently received this sword must have asked the original owner his details, or perhaps a Japanese prisoner translated a surrender tag for him, but anyway, faintly visible on the side of the BLADE (darn) just in front of the habaki is the scratch marks of a fountain pen with small traces of ink still present...it says in English
"Sword of 2nd Lt. Kume
Kaede (Yellow Autumn Leaves) Division
Made by Shigekuni"
Research shows that this is the 32nd Div., 2nd Army of the 2nd Area Southern Army (Gen. Inami) that was at Halmahera (N.E.I. Moluccas) at the close of the War. It consisted of the 210, 211 and 212 Tokyo Regiments of infantry. Most sources state that the Division was defeated by the Americans on Morotai (which is true) but let's not forget that the Australian were part of what the American media call an "Allied Force" that fought the Japanese to a standstill. Thos parts of the Division still on Halmahera surrended in August 1945.
It had a silver mon on the kabuto but it has been struck off.
Gotta love the WWII gendaito.