"Banner" refers to the Mauser trademark (commonly called the Mauser banner) on the toggle rather than a military code such as "byf", which was one of the wartime production codes used to disguise Mauser as the manufacturer of the weapon. The Eagle/N proof on the left side of the receiver over the serial number identifies this gun as a commercial model and therefore has the Mauser trademark.
P.S. David, looks like we almost had a "photo finish" posting!
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If it's made after 1918...it's a reproduction
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