Yep, it is a D-A and as far as I have been able to learn (but without exactitude), the scales mark has been used since around 1920. You can see some variations of it here.
http://www.925-1000.com/david-andersen_marks.htmlD-A is known for using sterling (.925) from around the same time period. Regularly for their exported wares, but I believe there is a good chance that they would have continued the use of .830 for the Norwegian market, the 830 standard is still used there today.
It is not likely that they would have stamped your bracelet .830 if it were of higher grade. However, whether 925 or 830, the standard has little importance. The silver bullion value of a bracelet or, for the matter, any small antique or collectible item is pretty close to pocket change. There are more important qualities to place value upon - beauty of the design, quality of craftsmanship, popularity of the maker and rarity of the item - to name a few. Your bracelet appears to have all of these. Interesting to see so purely a Nordic motif with Art Deco stylization, an interesting combo that I'd date to the thirties, though it may possibly be later.
Best, Tom