Obverse: Shallow top serif on digit 1; second 8 is 100% below curl.
Reverse: Middle arrow shaft unbroken at first talon; 5 is 20% under arrow feather; D is 100% under branch.
Also Breen 6515; small arrows; large 5.
The prooflike specimen sold in the Pogue sale (Stacks-Bowers, 2016, Pogue IV, lot #4057; the Parmelee-Byron Reed-Bass-Pogue specimen) is this variety. The Smithsonian collection specimen is also this variety and looks to be prooflike. No proof classic half eagles from 1838 have been certified.
Coin illustrated is NGC 58 (CAC approved) acquired from Douglas Winter Numismatics.
@Mark S. Ghiorso, ClassicHalfEages.com, December 2017