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Based on the detailed photos of the tang stamp and shield logo, this knife is a classic vintage Case XX manufactured between 1940 and 1964.
Dating Breakdown
• The Tang Stamp: The stamp reads simple block letters CASE with XX stacked underneath. This exact style is universally referred to by collectors as the "Case XX" era. Because it completely lacks the country of origin ("U.S.A.") or the dot system (which was introduced later in 1965 and 1970 respectively), it firmly falls within the 1940–1964 window.
• Narrowing the Window: During this era, Case introduced pattern numbers stamped on the reverse side of the master blade's tang around 1948. If the back of that main blade tang is smooth/blank, your knife was made between 1940 and 1948. If there is a 4-digit number stamped on the back, it was made between 1948 and 1964.
• The Shield: The oval-shaped handle insert features an "open C" with a "block S" in the word CASE.
