Just for comparison, below are some example of Opinels (first blade length, then blade stock thickness)
One can see:
- The Opinel No 6 with about "small" Chap blade length (or even a bit longer) gets away with just 1.33 mm blade stock (Chap has 2.00 mm)
- The Opinel No 9 which has an 3.51" blade still has less than 2.0 mm blade stock (1.91)
(And the Chap XL we´re talking about here would presumably also offer a 3.5 " blade
No. 6: 2.87" / 1.33 mm ("2.8 "Chaparral")
No. 7: 3.07" / 1.46mm
No. 8: 3.28" / 1.62 mm
No. 9: 3.51" / 1.91mm (" 3.5" Chaparral XL")
No. 10 3.92" / 2.14mm

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