1915-S Panama-Pacific Exposition. MS-67+ (PCGS).This incredible Superb Gem is far and away superior to the typically offered Mint State Pan-Pac commemorative half dollar. The obverse is drenched in an intense array of gold, emerald, cobalt and lilac, leaving only a small area of the center brilliant. The reverse on the other hand sports a thin multi-colored halo at the peripheries against otherwise brilliant surfaces. A smooth, lustrous and virtually pristine example that is sure to please even the most discerning collector. This coin was issued in connection with the Panama-Pacific International Exposition that was staged in San Francisco in 1915 to celebrate the completion of the Panama Canal, one of the greatest engineering feats of the era. All of the Panama-Pacific coins -- which range from 50 cents to 50 dollars (five different varieties in all) -- were struck at the San Francisco Mint, which was easily within walking distance of the fairgrounds. Most certified Panama-Pacific half dollars are in the MS-63 to MS-65 grade range, highlighting the importance of the present coin.