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Those are great-sounding radios, and the circuitry is time-tested. By that point Zenith had been using such design in slight variation for many years. Performance is admirable as a rule. I have a mid-'40s Zenith that has roughly the same circuit design.
The style suggests to me some German influence in the day.
Such dial drive scheme can be kind of a pain to restring. The stepping obviously is to lengthen the dial pointer travel length. If you have a Sams on the radio then they will probably give dial restringing details and drawings. Otherwise, be it me, I'd take a few pics from different angles of this drive system with the tuning at one extreme and/or the other. Then count the number of turns of the tuning knob to go from one extreme to the other. Then file such info away for future use should you have to do a restring.
Otherwise Reece gives good advice. If replacing the selenium rectifier is in your plans then substitute a 2.5A 1000PIV diode and a 22 ohm 5W series dropping resistor in its place.
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