Being a coin and PM guy, one of my (many) favorite or most interesting bits of WWII manufacturing is the creation of war nickels through the US mint. What a scary time to be alive during the heat of WWII....
War Nickels were brought about due to the increased demand and need for Nickle and Copper to produce munitions and alloys for other uses. From 1942-1945 Nickels had the copper content decreased from 75% down to 55%, and Silver was actually less valuable than nickel at the time due to the nature of our economy.
Your average nickel to that point was %75 copper and 25% Nickle, mid 1942 the alloy was changed to 56% copper, 35% silver, and 9% manganese, for a brief period of time. Each War-Nic as we call them, contains .05626 troy ounces of silver. This means 1$ face value of War-Nics is over 1ozt of Silver (AG).
Guys like me who started in Precious Metals while we were still young and broke LOVE War-Nics! Because you could buy them back then for a few cents or rolls were dirt cheap and they add up quick by AG weight. As we grew in our hobby or investment these Nickels were always great to sweeten trade deals or to combine and upgrade to something that took less space in your safe.