Japanese Sword

[CINDERS]

You can do the following,
Remove the sword from the scabbard carefully remove the peg in the handle knocking out left - Rt one end should be bigger as its a tapered peg (On my Shin-Gunto 98)' hold the sword vertical wrap a rag around the blade near the Tsuba top side so you dont cut your hand, then with the bottom of the handle a few inches from the ground or table strike the handle obliquely and downward with bottom of your open hand like a Karate chop (Please don't use a mallet) to remove it from the sword take note how the seppa and Tsuba are stacked together.
You can then see if there are any characters on the Nakago (Tang) assemble in the reverse order and point down tapping the handle on by hand and re-pegging the same way it does not require gorilla tactics they usually come apart easily always wipe them over to remove any oils & moisture from your hands on the metal surfaces.
I use a thin coat of balistol on my blade.

Pics of my Shin-Gunto 98 & Nakago (Sorry NFS)

Mine has been deciphered for place of manufacture and who made the sword.
高山鍛錬所於氏房之作
Takayama Tanren-jo [ni] Oite Ujifusa kore [wo] saku
This was forged by Ujifusa at the Takayama Forge

He is listed as "Chu-Saku" (mid-level) here and his real name was
篠田 氏房
Shinoda Ujifusa

The site states gives him a "3" notation (Superior):
"...In additon, winners of the 6th Shinsaku Nihonto Denrankai (新作日本刀展覽會, 1941) were reported at Nihon Kendo Oyobi Token (日本劍道及刀劍) by Hagio Takahashi. From Special Honor Seats to the 5th seat (S: 特別名譽席(鍛刀總匠), 1: 國工, 2: 準國工, 3:優秀, 4:佳作, 5: 新進)..."