Watch List notes:

DENMARK: Frederik III, 1648-1670, AR 4 marck (krone), 1667, Dav-3581, F3 as script monogram, initials GK, reverse legend reading left to right, NGC graded AU55. Confusing type, obverse clearly type Dav-3581B, but with the initials GK, as on 3581A, but with reverse legend also only on 3581B. Incorrectly marked Dav-3580 on the holder.

Estimate: 325-400 USD