What is the value of a 1943 silver penny misprint?

Not silver and not a "misprint"*

Assuming you are referring to a US penny with Abraham Lincoln on it, all 1943 pennies have a somewhat silvery appearance because they were made of steel with a zinc coating. Steel was used to save copper for the war effort.

Any that you find in average condition are probably worth no more than about 25 cents. In exceptional condition they can be worth anywhere from a dollar to a couple of hundred, however.

Now if you had a genuine 1943 penny made of copper (of which a handful are known), then you'd have something of great value - thousand of dollars. (*) Please note that coins are not printed, they're struck. "Printing" refers to paper and ink, e.g. dollar bills.