The "Last" Sovereign . . .
Numismatists are nothing if not history buffs, so here's a good coin to add to your collection as a talking-point.  The 1932 Gold Sovereign was the last issued as circulating currency - after this, the coin was retired, and returned some twenty-five years later as a bullion coin with no specific face value.

The coin pictured is slabbed and officially graded by NGC as MS63
22ct gold, 7.98 g

 (Pretoria Mint coin pictured)