It's not an SA uniform, but an early uniform for NSDAP Political Leaders.
His rank insignia are of the short-lived 1933-1934 pattern. The twin silver Litzen on the collar patches combined with the two knots on the silver shoulder cords and cap corps identify him as a Kreisleiter. (The same design was also worn by the ranks of Reichsinspekteur and Reichsorganisationsleiter, but in gold.)
Here is a stylized insignia table for this period:
File:EarlyNaziPartyRanks-NARA.jpg - Wikipedia, the free encyclopedia
The black sleeve diamonds on the left upper arm were also short-lived and only used around 1933 until they were replaced by the Swastika brassard. (For a brief transitional phase, they were worn together with the brassard.)
Only a part of the central emblem on his sleeve diamond shows, but it appears to the "Party-Badge"-like design worn by Stabsleiter (= staff leaders).
[There were other sleeve diamonds, too: For example, those of Amtswalter (Officials) had the "political" national insigne; those for faction leaders in the Reichstag a shield design with their state's colors and those for faction leaders on city councils their city's emblem.]
Last edited by HPL2008; 10-19-2010 at 05:36 PM.
Yes; Diplomlandwirt is the academic degree held by a college-/university trained Agronomist. (The best-known example for a holder of this degree being, of course, Heinrich Himmler...)
On the cover of the Gau Baden ID, Plesch's job is given as "Geschäftsführer der agrarpolitischen Abteilung", i.e. Manager of the Agro-Political Department.
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The position of "Geschäftsführer der agrarpolitischen Abteilung" is supported by the signature of Richard Walter Darré, the later Reichsminister of Food and Agriculture.