I'm not sure I'd identify it as a problem. It is certainly a variation, unless you dislike the color...
The color is involved in a combination of the alloy composition of the steel, the salt bluing chemical process, heat and time...
It's likely that the Swiss changed their approach after this since my 1938 has a very different and uniform almost black appearance.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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