I've highlighted the titanium issue, but the set includes other various metals, and even a commemorative stamp, all from the cleverness of Tom Maringer at the Shire Post Mint for the benefit of the membership of the Ozarks' Coin Club in Springfield, MO: http://www.hal-pc.org/~edi/gmm/07occs5.html
My icon is a photo composite of the profiles of Gallery Mint Museum founders, Ron Landis and the late Joe Rust, adapted from the silver GMM Hobo Tokens of 2003 and 2004 respectively: http://www.hobonickels.org/stm-arch.htm