This folder of Koji's is at Nordic Knives. Junko picked it up in the mid-later 90's.
Details here:
https://nordicknives.com/collections...p-joint-folder
1 1/2" blade of stainless steel, mirror polish, 2 5/8" closed length
Gold lip mother of pearl bolsters
Black lip mother of pearl scales
Nickel silver liners
Stainless steel back spring
Mint condition
$299