Greetings all. I hope I can make a useful contribution here.
This coin is listed with composition “Copper-nickel clad copper-nickel (Cladding: 75% Copper, 25% Nickel; Core: 97% Copper, 3% Nickel)”, identical to the composition of the 1 Kr of 1968-73 and 1976-81. In a comment, it is stated :
Krause's "Standard Catalog of World Coins" makes a difference between coins minted 1976-1992 (KM# 853) and 1993-2009 (KM# 853a), but it is unclear on which grounds, as the Swedish Riksbank does not recognize any changes in composition.
Regardless of what the Sveriges Rigsbank does or does not recognize, I can state that I have here at my desk a 1983 and a 1992 specimen. Both of these are slightly attracted to a magnet (can be lifted), while not a single one of three 1 Kr pieces (1973, and two 1979) is so attracted. Therefore I conclude that the core is pure nickel, as listed for the 5 Kr of 1972-3, and not cupronickel.
Unfortunately, I do not have a post-1992 specimen in front of me, and so I cannot say whether the issues subsequent to that date are ferromagnetic or not.
(Purely for my own amusement, I tested this coin against a German pay-phone in my possession which accepts Magnimat 2 DM and 5 DM coins. It was rejected, which is not surprising, as it is 0.5g lighter and 0.5mm smaller in diameter than the 5 DM.)
