10 Dollars Martin van Buren's Liberty, Bullion Coinage

The "First Spouse" bullion series was authorized under the Presidential $1 Coin Act of 2005, which mandated a companion gold issue for each president honored in the circulating dollar program. Van Buren presented an awkward problem: a widower whose wife Hannah had died nearly two decades before he took office, he never remarried. The Mint's solution was to use the allegorical Liberty figure from Van Buren's era coinage rather than a portrait — one of only a handful of such substitutions in the series.

Struck in four-nines fine gold, these saw modest mintages that have held collector premiums well above melt.