The 1814/3 Overdate Half Dollar is a very popular issue and has been a significant part of the Bust Half Dollar series for decades. The overdate is very clear, consisting of the top bar of the 3 beneath the 4. This was done to save money by repurposing an old die instead of casting it aside and creeating a whole new one in the following year.
The 1814/3 Half Dollar comes in one variety with two distinct die states (O-101 and O-101a). There is no such thing as a perfect die 1814/3 Half Dollar, as they all show some degree of die-cracking and clashing. On the O-101a, the cracking becomes more evident and affects the bottom of the date. On the reverse, the die begins to take on a dished appearance and the denticles begin to merge with the tops of the letters of the legends.
There are at least a dozen Mint State examples of the 1814/3 Half Dollar. Most are them grade MS64 or lower. The finest example is a single NGC MS66 that sold for $48,875 in a 2010 auction.