35% silver, 56% copper, 9% manganese A bit low on silver content but I wouldn't mind a few for my collection (of coins with an interesting backstory) http://www.coinflation.com/coins/1942-1945-Silver-War-Nickel-Value.html
If you're not very familiar with them, other people aren't either. Hence, fewer potential buyers if you decide to sell. Stick with 90%. You'll be glad if you decide to sell. It'll be much easier and faster. Take care, Tom