This wooden box is a vintage shipping crate for sujiko (salted salmon roe).Key DetailsFront Inscription: The large Japanese characters read "筋子" (sujiko), which refers to salmon roe that is salted while still encased in its original ovarian membrane.Origin: The "Product of U.S.A." label indicates that the contents were harvested in the United States—likely in Alaska or the Pacific Northwest—and prepared for export to Japan.Purpose: These sturdy wooden crates were standard for transporting processed seafood internationally during the mid-20th century.