Whites Surfmaster PI Pro and Whites Surfmaster PI, Minelab Excal NY blue sword. 2 White's Dual field pi, Garrett sea hunter pi II (but don't use it for obvious reasons) 5' x 3 1/2' coil underwater Pi
Congratulations on finding an Indian head penny - see the properly rotated reverse pic below.
Just for future reference, gold is far more resistant to corrosion than something like an Indian penny, which was bronze (95% copper). Even with exposure the worst ground/sea conditions, gold wouldn't look nearly that eaten away.
It's really the "wreath" side, strictly speaking... "wheat" side, technically, is what's found on the Lincoln wheat-back cent... Rotated it properly, shrank it a bit to increase clarity, and the negative effect is called "Invert Colors" or something to that effect - useful for flushing out detail sometimes. Most basic photo-editing programs can do this and more.