Vintage Marked Silver.
About The Wartime Nickel 
While 90% junk silver and 40% junk silver are more widely known, many don't know that during WWII the nickel was comprised of 35% silver. From 1942-1945, the "Wartime" nickel was produced. While these look similar to the Jefferson Nickel design we are familiar with, there is one key difference. The mint mark is visible above the monument on the reverse side of the coin on all those that are silver, even those from the Philadelphia mint. "Wartime" nickels are a great way to invest in divisible silver, just like 90% or 40%, but typically carry an even lower premium over spot.