Banjar Gal, are you able to post photos of the machine? It would be nice to see it.
Apologies to Banjar Gal for the digression... Jon, I know Dietrich switched over to arms, as did many of the other sewing machine manufacturers. The Russians can be held entirely to blame for the fact that Dietrich, Kohler and other manufacturers in Eastern Germany never returned to their pre-war glory and ended up producing indifferent machines for the USSR and Eastern bloc. When I eventually show pictures of my 1936 Vesta Transverse Shuttle you can weep with me.