Ron Guth:
The New England Shillings are among the simplest, most valuable, and rarest of all Colonial U.S. coins. They are simple disks of silver that are not much larger than a U.S. Quarter Dollar. On one side, the minter punched the monogrammed letters "NE", which stood for New England. On the other side, the letters "XII' were punched, indicating the denomination of 12 Pence (based on the English monetary system, though the NE Shillings were valued statutorily at only 75% that of an English Shilling). These simple, yet elegant coins, were made in 1652, but some researchers believe at least one variety may have been made later.
High grade examples are very rare. Thus, for most collectors, any example would be acceptable. A couple of nice AU examples are known, but none have ever been called Mint State. New England Shillings rarely appear on the market and they always set records when they do.