The coin shop said it wasn't quite AU, so I'm guessing EF/XF. By far the best condition Merc I've found, too bad it's a pretty common 1941-S. Also found 6 Silver Roosies today.
Handy tool for grading coins. If all the vertical sticks in the fasces are clearly defined along their whole length, and the diagonals don't blend with them, it's probably XF.