They are worth about as much as their Raleigh contemporaries. Although be careful since some of them have Sachs torpedo 3 speeds, which are not interchangeable with sturmey archer anything (and parts like shifters are near impossible to find in the U.S.) - so make sure nothing is missing.
If it was cheap I'd buy it but I'd cap it at $50 max. Any more than that and it wouldn't be worth my time. Also check out the tires, if they are not like new or they are flat talk him down! Budget another $40 for tires and tubes. You might get $100 out of it so profit margin is slim already, I have a nice Schwinn 10 speed with brand new tires and tubes on C-list right now for $125 and it isn't selling too fast.
Austria. The Daimler/Puch/Steyr collective made those bikes for Sears, with Puch building the 3 speed touring bikes. There were some W. German built ballooners built in 1956, due to a US strike presumably at Murray. In the 60s, there were also canti framed middleweights that were a cross between an american mw and a Euro touyring bike. -Adam