It looks like he went from the RAD to the Army (Arlillerie) and that he is wearing a walking out dress uniform" ausgehanzug" with sword and the early Waffenrock tunic and peaked cap.
You should look at the shoulder straps with a magnifying glass as they may well have his unit number on them.
As the number will be in red against a dark green background they may be difficult to see.
Best of luck
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