A gold coin (19 mm diameter with milled edge) featuring a bare head of King Edward VII facing right; around, EDWARDVS VII D: G: BRITT: OMN: REX F: D: IND: IMP: below the head in tiny letters the artist's initials DeS. The reverse features St. George on horseback holding short sword, the horse rearing to right over a fallen dragon which has a broken lance in its chest; in exergue, the date, 1909 and the artist's initials B.P..
The mint mark (if any; coins struck at the Royal Mint London do not have a mint mark) is in the ground above the middle of the date.
Bare head of King Edward VII facing right; below in small letters De S. (for G.W. De Saulles, Mint Engraver); around, the legend EDWARDVS VII D: G: BRITT: OMN: REX F: D: IND: IMP: (Edward the Seventh, by the Grace of God, King of all the Britains, Defender of the Faith, Emperor of India).
St. George on horseback holding short sword in right hand, wearing a flowing cape, helmet and boots, streamer flowing from helmet; the horse rearing to right over fallen dragon which has a broken lance in its chest; the date, 1909 in the exergue; below exergue line at right the artist's initials B.P. (Benedetto Pistrucci).
Reverse B according to Marsh: designer's initials B.P. in exergue, longer and thinner exergue line, larger image of St. George (due to this, the rear of the cloak and the front foot of the dragon are nearer to the border). The dragon's wings have been redesigned, the folds in the cloak are rearranged, St. George carries the sword at a slightly lower angle.
Royal Mint London coins do not have a mint mark. The mint mark for branch mints (M for Melbourne Mint, P for Perth Mint) is in the ground under the horse's right hoof, above the middle of the date.
References to additional information:
[Book] Marsh, Michael A. The Gold Half Sovereign. Cambridge, UK: Cambridge Coins, 1982. pp. 41-46.