This beautiful machine was built in the mid thirties in Germany. Adler is the German word for eagle; and this machine is as beautiful as the bird of prey.
Having the long cylinder arm allows the user access into the deepest part of a riding boot. The foot also rotates to allow repairs where most sewing machine dare not go - actually places they cannot go.
Also check out my post on the Adler 30-70 for sale on eBay, I might add: