Actually they do still make them like this. Check out Purdey, Boss, or Holland & Holland and you'll find a higher level of quality than that Sauer & Sohn and a price that illustrates why 100% hand made guns are so rare today. Note, compared to Purdey and Boss a Holland & Holland is a "budget" gun. Currently a matched Purdey pair will set you back about 1 million dollars.
Concerning that Sauer, at the time it was a premium gun but not a top rank fully engraved show quality gun. In simple terms it was intended to be used, a lot. In today's dollars that was a 3-6000 dollar gun, something a upper management type would purchase with the intention of giving it to a grandson when he was at the end of his ability to shoot. So it was built to be a 100 year gun and obviously is proving that it is indeed a 100 year or better gun. So I would suggest that from time to time you take that one out and shoot it. Note, modern Target loads are just fine in those barrels provided you use the correct length shells. If the barrel says 2 inch chambers then do NOT use 2 3/4 inch shells, take the time to source 2 inch shotshells. BTW the shorty shells for increased capacity in Semi's and Pumps will work provided the velocity is less than 1300 fps.