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Case
Case XX 6231 1/2 from 1975 is a heavy-duty, two-blade jack knife, often referred to by collectors as a "Swell End Jack" or "Heavy Jack". While the "6" in the pattern number traditionally denotes bone, Case began substituting bone with Delrin (a durable synthetic) in the late 1960s while retaining the "6" prefix.
Case XX 6231 1/2 "Swell End Jack" Delrin ~ Vintage 1975
$95.00
Current stock:
1
Case XX 6231 1/2 "Swell End Jack" Delrin ~ Vintage 1975
1976 Dating & Identification
- Tang Stamp: A 1975 model is identified by the 4-dot tang stamp. Case's dating system for the 1970s started with 10 dots in 1970 and removed one dot each year, leaving four dots for 1976.
- Handle Material: Though the pattern starts with "6," 1976 versions often featured jigged Delrin handles designed to mimic the look of genuine bone.
- Shield: Case transitioned to shields without a circle around the logo starting in 1975, so a 1976 model typically features this newer "no-circle" shield.
Specifications & Blades
- Pattern Number: 6231 1/2. The "6" indicates the handle material (Delrin in this era), "2" indicates two blades, "31" is the frame shape, and "1/2" specifically denotes the presence of a clip point master blade.
- Main Blade: A 2 7/8-inch clip point blade, usually featuring a "long pull" nail nick and a half-stop for safety.
- Secondary Blade: A 2 1/4-inch long spear or pen blade.
- Steel: Typically manufactured with high carbon steel, which develops a natural patina over time.
- Closed Length: The knife measures 3 3/4 inches when closed.
- Construction: Features brass liners, brass pins, and polished nickel silver bolsters.
- Used/ sharpened
- No box
- Condition is excellent, see chart below
NKCA Grading system
MINT: A factory fresh knife, absolutely original as it came from the manufacturer, not carried or sharpened, a perfect knife.
NEAR MINT: A new knife that has seen sometimes, show some slight carry or shop wear, blades snap perfectly, handles show no cracks.
EXCELLENT: Shows no more than 10% blade wear, handles are sound, no cracks, blades snap good.
VERY GOOD: About 25% blade wear, slight cracks in handles, may have one lazy blade, stamping clearly visible to the naked eye, no blades changed or repaired.
FAIR: 50% blade wear, blades lazy, cracks and chips in handles, handles replaced with same type, blades repaired, stampings faint but readable with a glass.
POOR: Blades very worn, handles bad or missing, blades have been replaced with the same type, reading of the stamp is almost impossible, even with a glass, good mostly only for parts.
