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I believed that Neil is talking about the name change in 1915 to F.Herder & Sohn. From the catalog page you posted from 1920 and the trademark registration from 1927 that i posted on post # 6 on this...

That thread stirred me in the wrong direction, looking at all the trademark for F. Herder Abr. Sohn all of them are registered to Friedrich Herder Abr. Sohn, none of them for Herder & sohn. But...

Welcome to SRP Luco, seems like you allready found much about the history behind your razor, but furthermore by looking at the razor its shape, and materials used for scales, i would date this razor...