A typewriter manufactured by Adler in Frankfurt sometime around 1932, according to this site here, based on the model similarities and the closeness of serial numbers (this one's SN is 423786). The typewriter seems to be in decent shape, but it could use a good cleaning before you write your next great novel on it, some of the keys stick and there's gunk in the workings.

While this typewriter was manufactured prior to the Second World War and even before the Nazis rose to power, it is worth noting that the Adler company happily worked alongside the Nazis and leased the Adlerwerke, the factory where this typewriter was manufactured, to the Katzbach concentration camp (a "satellite" of the Natzweiler-Struthof camp) and used forced labor of Polish prisoners from the years 1941-1945, with prisoners selected from Buchenwald and Dachau to manufacture vehicle and armament parts and machinery. Adler did not suffer any consequences for their direct support of the Third Reich or for their direct involvement in the Holocaust other than some of their factories being destroyed in the bombings while Germany surrendered, and the company operated until 1998. You can find more information about the Adlerwerke here, at the memorial webpage, though it is in German, or here, at a memorial page for Natzweiler-Struthof.