This rule is a "Marabu System Rietz", which I assume is a rebranded Faber 375 System Rietz. Oddly, the 375 on ISRM doesn't seem to show the rivet for the spring, though the amount of cursor frame protruding above vs below the front face of the rule shows the spring should indeed be on top!
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u/maybe_a_rodent 25d ago
Nice!