Welcome to the "Classic Gold Collectors Club!" The 1838-C half eagle is hardest piece in the set to find nice. I looked at many of them until I found the one that worked for me. The 1838-C was not as well made as the 1838-D, which can be found in AU for a price. My 1837 half eagle is in a PCGS MS-61 holder, and I am quite happy with it. I traced it back using the Newman Portal site to the 1976 ANA auction, which was held by Stacks' in New York City. There it was graded AU, which is the true true grade. Coin grades are quite fluid, as you probably know. You might know that we are collecting "Mint Drops." That was name the opponents of Andrew Jackson and Martin Van Buren gave to them on some Hard Times tokens.
Not much happening here, yet.