Usually overdates occur when the mint has left over dies from the previous year and use it for the current year, first by lapping (sort of like sanding down the die) and then punching the new date over it. It then becomes an overdate. There is a known 1883/2 variety but unfortunately this is not it. This is what known as a 1882 "Filled 2". It is called that because when an 1882 Shield nickel is worn down the 2 begins to turn into a blob. Unfortunately, it is very common and not worth a premium.
