dzug is correct except for two points.
The 1977 Silver Jubilee Crown can not have a face value of 5 old shillings since it was minted post-decimalisation. Crowns minted prior to 1971 would have had that value; after 1971 they had a value of 25p and since 1990 Crowns have a value of �5.
The coin did enter general circulation (as all Crown issues do) with 37,061,160 of the coins being minted, which was more than 50% greater than the number of 5p coins that were struck the same year (24,308,000).