A) Gyttorp is a Swedish ammunition firm based in Ingelstad and founded in 1908. I think these cartridges date from the 1980s and are loaded with nickel-plated lead shot. Plating shot gives it a hardened exterior that makes it less likely to become deformed when fired.
I doubt that these cartridges have any collector value, and I would be inclined to use them. They are intended for use in nitro-proofed 70mm 2¾in chambered guns. The nickelplated shot will not give any problems with chokes, because the coating is very thin.