The silver nickel on the left looks like what a well circulated never in the ground silver nickel almost always looks like. I've dug a couple that looked similar to the one on the left, but the one on the right looks more like a typical dug coin.
The manganese in the silver war nickels is why you often see degeneration when they come out of the ground.
The silver nickels I've dug have varied widely in appearance and how they've reacted with the ground. Likewise, there is no typical silver nickel VDI.
Silver nickels were minted 1942-1945 and beyond their different metallic composition and wear characteristics, all of them (including Philadelphia strikes) have that big mintmark on the upper reverse of the coin.
All of the silver nickels have silver bullion value many times higher than face value and are fun to find, but none of the dates are rare. If I remember correctly, the 43-D was the lowest mintage. Except in high grade, it doesn't command any premium over bullion value that I know of.
The only year both traditional nickels and silver nickels were minted was 1942.