The Iso Uppo carries the essence of the classic puukko but in a bolder size. I find its extra cutting length useful for larger chores trimming branches, preparing kindling, or handling bigger cuts. Yet it still handles detail work respectably. In the wild, it offers more versatility when your tasks scale beyond the smallest slice.
Based on related models from Iisakki Järvenpää, the blade is likely in carbon or stainless steel, with hardness in the 57–58 HRC range typical of their fuller blades. The handle is expected to be curly birch (visakoivu), lacquered, giving both aesthetic appeal and a secure grip. The sheath is probably leather with lining and belt carry setup.
Because official spec details are limited, consider this a general outline rather than exact numbers. Stock can fluctuate, so order soon if you want one in your kit.
Specifications
- Blade length: 125 mm
- Overall length: 275 mm
- Blade material: carbon or stainless steel (exact grade not given)
- Hardness: likely ~57–58 HRC
- Handle: lacquered curly birch (visakoivu)
- Sheath: leather with lining and belt loop
- Weight: 140 g














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