Salt blue is a taste. Commercial Mauser's salt blued guns were all highly polished before bluing, and their salt blued post 1927 Bolo was a beauty. 1930's salt blue was a little bit less (1%? hard to quantify) than that of salt blued Bolo. Comparing Astra (rust blue) and 1930 (salt blue, same era) side by side, I still feel rust blue finish is a little bit more classical.
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