A 1966 Special Mint Set (SMS) with a "Ghost FG" on the Kennedy half dollar, graded MS-66 to MS-67 by NGC, is noteworthy and AuSOME for Several Reasons:

Special Mint Set (SMS)

Limited Production: In 1965-1967, the U.S. Mint did not produce proof sets or uncirculated sets due to a coin shortage. Instead, they issued Special Mint Sets (SMS), which were produced with higher quality than regular circulation coins but not to the same level as proof coins.

Collector's Item: SMS coins are popular among collectors due to their unique status and limited availability compared to regular mint issues.

Ghost FG on Kennedy Half Dollar

Variety Feature: The "Ghost FG" refers to the faint or almost missing initials "FG" (Frank Gasparro, the coin's designer) on the reverse of the Kennedy half dollar. This is a known variety and adds interest and value to the coin for collectors who specialize in varieties and errors.

Rarity: The Ghost FG variety is relatively rare, making it more desirable among collectors looking for unique or unusual coins.

High Grade (MS-66 to MS-67)

Quality: Coins graded MS-66 to MS-67 are considered to be in exceptional condition with very few, if any, marks or imperfections visible without magnification. This high grade enhances the set's desirability and value.

Certification: Being graded by NGC, a reputable coin grading service, provides assurance of the coins' authenticity and quality, increasing their appeal to serious collectors.

Included Coins

Complete Set: The set includes the Kennedy half dollar, Washington quarter, Roosevelt dime, Jefferson nickel, and Lincoln penny, making it a complete representation of the 1966 SMS coinage.

Consistent Quality: All coins in the set are of high grade (MS-66 to MS-67), offering a uniformly high-quality collection from this year.

Overall Appeal

Historical Context: Collecting a 1966 SMS set offers a snapshot of U.S. coinage during a unique period when the Mint was addressing coin shortages.

Investment Potential: High-grade coins with interesting varieties like the Ghost FG can appreciate over time, making them appealing both as collectibles and potential investments.

Overall, a 1966 SMS set with a Ghost FG Kennedy half dollar in such high grades is a significant and attractive piece for collectors due to its rarity, condition, and the historical context of its production.