The Crown was originally intended to commemorate the ascension of King Edward VIII however due to Edward VIII's abdication, it was instead struck to commemorate the ascension of King George VI (Cruzi's Coins, 2009). This commemorative appeal was lost in 1938 when the series continued though the lack of popularity made the series terminate after just 101,600 coins in 1938.
The Crown or five shillings features a crown on the reverse with COMMONWEALTH : OF : AUSTRALIA at the top half of the legends and ONE CROWN at the bottom with the date just above that. The obverse features the uncrowned bust of George VI with the legends, GEORGIVS VI D : G : BR : OMN : REX F : D : IND : IMP (George VI by the grace of god, ruler and king, defender of the faith, emperor of India).
Both dates are notorious for large bagmarks due to the large size and weight of the coin and the the distribution process via ship and rail (Coin Web, 2007) though the 1938 is by far harder to obtain in higher mint state grades mostly due to its low mintage.
Collector proofs were issued at the issue price of 6/- (Sharples, J, 1990) in both years with a sell out mintage of 100 in 1937 (Verheyen, T, V, 2009) plus 5 proof of record pieces but in 1938 only 52 out of the mintage of 100 were sold (Sharples, J, 1990).