The 1943 silver colored penny is a wartime issue made of steel, and coated with zinc. During World War II, copper was so badly needed for the war effort (to make shell casings) that the U.S. penny was made out of steel that year, which is why most 1943 pennies are silver colored. They are worth about 12 to 15 cents each in ciruclated condition, and as much as 50 cents or more if Uncirculated.
It reminds me of the old Sesame Street song:
One of these things is not like the others,
One of these things just doesn't belong,
Can you tell which thing is not like the others
By the time I finish my song?