Going to throw my two cents in. First: both pieces look decidedly mid-19th century to me. If the digits are 71 and 66, then they might well be dates: 1871 and 1866. Second: the name suggests Scandinavia, and the the only Scandinavian countries at the time which didn't have strict silver marking regulations were Norway and Iceland; I think you can exclude Sweden, Finland and Denmark as possibilities. The surname and paucity of makers in Iceland would rule it out, too (to me, anyway), and that leaves Norway. The last two digits of the year are not at all uncommon on Norwegian silver in the mid-19th century, and Hagberg is a not uncommon Norwegian name. If the crowned "U" is some sort of city mark - which it may or may not be - that would narrow down the search considerably, since there aren't that many Norwegian cities beginning with U. I tried to find regional Norwegian town directories online from those years but had no luck. But my money's on Norway, and that's where I'd look.