So the numista page says that the medal is nickel silver. However, Wikipedia claims that it is “struck from tombac and then silver-plated and oxidized." I'm more in agreement with Wikipedia as when I purchased mine it was tested for any silver content which it came back positive. If it was nickel silver then there would be no real silver content due to nickel silver being composed of 60% copper, 20% nickel and 20% zinc.
Would it be worth it to change the composition listed on the page or am I missing some information that would make the use of nickel silver the more logical option?