I found it (I think). Krause #389 German occupation issue. Krause doesn't have pictures which is what was causing me trouble. Plenty listed on eBay. Nothing like spending a ½ hour trying to ID a 50¢ item.
Zinc doesn't usually come that nice. That's definitely more than a 50 cent coin, even as a type set example.
Even though the Nazis invaded in 1940, many of the coin designs didn't change until 1941. I think the Germans didn't expect the King to escape and have a government in exile, and eventually decided it looked bad to issue coins under the name of a king who was still actively opposing them. Here are the 2 varieties of 1 Ore from 1941. I wrote a coin blog post on the 2 types if anyone is interested. And here are my notes on which metals were issued which years during WW2: 1 ore Haakon VII bronze 1908-1941, 1946-1952 Nazi occupation iron 1941-45 2 ore Haakon VII bronze 1909-1940, 1946-1952 Nazi occupation iron 1943-45 5 ore Haakon VII bronze 1908-1941, 1951-1952 Nazi occupation iron 1941-45 10 ore Haakon VII copper-nickel 1924-1941, 1945-1951 Nazi occupation zinc 1941-45 25 ore Haakon VII copper-nickel 1921-1940, 1946-1950 Nazi occupation zinc 1943-45 50 ore Haakon VII copper-nickel 1921-1941, 1945-1949 Nazi occupation zinc 1941-45 Krone Haakon VII copper-nickel 1925-1940, 1946-1951 Not minted during occupation 2, 5, Krone etc. not from this era 1941 mintages (millions) 1 ore bronze: 12.26 1 ore iron: 13.4 5 ore bronze: 3.76 5 ore iron: 6.608 10 ore Cu-Ni: 10.15 10 ore Zn: 15.31 50 ore Cu-Ni: 2.373 50 ore Zn: 7.761 1941 bronze or copper nickel mintages are high compared to previous years. Iron or zinc 1941 mintages are even higher probably to replace the missing 1 Krone.
