It is thought that the Shirahagi & Saotome meteorites might be part of the same fall, even though there is 40km between the two finds. This area is located around the city of Toyama.
I think a large part of the 23kg mass from Shirahagi was used to make some famous swords, with the remaining mass assumed lost.
If your meteorite was found around the Toyama/Nanto area, it would be a great discovery to confirm if the two falls are related.