The 1926 Indian Head (Buffalo) Nickel in MS 66 is a highly collectible coin from the famous Buffalo Nickel series, which was minted from 1913 to 1938. Here's a breakdown of its details:

The 1926 Buffalo Nickel features a Native American portrait on the obverse, often believed to be a composite of three different Native American chiefs, and the reverse shows a buffalo standing on a grassy knoll. The Buffalo Nickel is one of the most iconic U.S. coin designs, and the 1926 date is one of the later issues in the series.

The MS 66 grade indicates that the coin is in near-perfect condition. Coins graded MS 66 show minimal imperfections, with a high level of detail and very few visible contact marks. It retains much of its original luster and would be a stunning example for collectors of this series.

The CACG is likely a typo for CAC (Certified Acceptance Corporation). If the coin has received a CAC sticker, that means it has passed an additional layer of scrutiny and meets a higher standard of quality for its grade. A CAC sticker adds value and desirability to the coin, as it assures collectors that the coin is one of the best examples of the MS 66 grade.

In summary, a 1926 Indian Head (Buffalo) Nickel MS 66 with a CAC sticker would be an excellent addition to any collection, representing a high-quality, well-preserved example of this historic and popular series.