Prior to about the mid-1930's tank bluing as we know it today did not exist. Bluing was either rust bluing or some other form of bluing, such as oil blackening and the carbona blue that was used by S&W and Colt.
Rust bluing took time, but did not really slow production once the factory pipeline was full. And it is by far the best looking.
IMHO, the VZ-24 is the best of the Mausers of that era, though the FN and Mauser Model 24 are nice.
Jim
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