Grohmann R350S Jack Knife?

[afishhunter]

Grohmann says they "sharpened" the blades to between 50 and 60 degrees inclusive.

From what I can find online, the blades are most likely 4116 Krupp.

Any reason(s) not to reprofile the edges to 20 degrees inclusive?

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[Obsessed with Edges]

4116 is roughly equivalent to something like 420HC. Most knives made with steel like this might be hardened to mid/high-50s HRC. Grohmann states their 'outdoor' knives' stainless is comparable to 4110 (essentially same ballpark as 4116), with their pocket/lockblade knives in a stainless similar to AUS-6 (again, very similar to the others mentioned) and all theirs are in the HRC 56-58 ballpark. Anything between 30° - 40° inclusive should be fine, at least. With such steels in traditional pattern knives and the typically simple EDC tasks associated with those patterns, I'll usually take them to 25° - 30° inclusive, eventually.

20° inclusive (10° per side) might be too 'delicate' for such a steel. I'd expect to see edge-rolling at that thin geometry, in steel like this. That's why I don't generally go below 25° inclusive (12.5° per side). Great slicing geometry at that point, with still enough edge stability to make maintaining it worthwhile.