According to the Royal Mint and Britannia Coin Company, the 1889 Crown meets the following physical standards:
Composition: .925 Sterling Silver.
Weight: Approximately 28.28 grams (standard 10/11 troy ounce).
Diameter: 38.61 mm (some sources list 39 mm).
Obverse: Features the "Jubilee Head" of Queen Victoria by Joseph Edgar Boehm, introduced in 1887 to mark her 50th anniversary.
Reverse: Depicts Benedetto Pistrucci's classic "St George and the Dragon" design with the date 1889 in the exergue.
Edge: Reeded (milled), not inscribed.
Mintage: Approximately 1,807,224 for the standard currency issue.