All About Pocket Knives

Hello all...I have this knife here and am needing some assistance. The knife is large and heavy. Looks to be 1800's but I don't know. Of course it's unmarked. 4 1/2" long. Any help would be appreciated..thanks

https://www.allaboutpocketknives.com/kn ... 2#p1103782

I have a similar one. Mine has some kanji lettering, i think, near the spine that i haven't been able to translate. So it's Japanese. I don't have any idea on its age, though if i had to guess I'd say 1930's-50's, based solely on knowing that roughly similar looking keychain multitools were made in Seki in that time frame.

Thanks for the info..