Watch List notes:

George IV (1820-30), Silver Proof Crown, 1826. Bare head left, date below, Latin legend and toothed border surrounding, GEORGIUS IV DEI GRATIA, rev. inverted die axis, crowned and crested helmet over quartered shield of arms, with a crowned escutcheon of the Arms of Hanover, French language motto on banner below DIEU ET MON DROIT, Latin legend and toothed border surrounding, BRITANNIARUM REX FID: DEF: edge inscribed in raised letters, DECUS ET TUTAMEN* ANNO REGNI SEPTIMO, weight 28.27g (L&S 27; Bull 2336; ESC 257; Davies 151; S.3806). Attractively toned, with only a few tiny flecks and spots and the lightest of hairlining, has been graded and slabbed by NGC as PF63. Estimated Value $15,000
NGC Certification 2722101-001. We note at the time of writing that 106 examples of this crown have been graded by both services of which only 33 grade finer. The Latin legends translate as on obverse "George the Fourth by the grace of God," and on the reverse "King of all the Britains, Defender of the Faith" and upon the edge "An ornament and a safeguard, in the seventh year of the reign." The banner motto translates as "God and my right."
Ex Spink Coin Auction, 26th September 2006, lot 209.