I am familiar with the "Canoe" pattern, but was curious about the Case "Copperhead" pattern. What is(are) the distinguishing feature(s)? Additionally, I have my Dad's old 52033 (small pen), a pattern that I can not seem to find in current production knives. I found plenty of 33 patterns, but no 033's. Is there a difference in the 33's and the 033's. If not, why is the 0 in my knife's part number.
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