Accolades to the astute purchaser.

Mintage of 30 in silver proof.

http://www.ebay.com/itm/141726015777?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Bronze version is still being offered at the Royal Hawaiian Mint website

http://www.royalhawaiianmint.com/catalog/private-issues/1992-waterhouse-commemorative-in-bronze.html