Commemorative coin depicts the mask of the Deity Chaac, an elaborately carved wall segment whose design is replicated hundreds of times in the facade of the Temple of Kabah in the Yucatan. Dennis Jarvis from Halifax, Canada / CC BY-SA 2.0. Régis Lachaume / Public domain.
2018 North American Coins & Prices 27th Edition. By Don & Lois Bailey ISBN 0794839541 page 402.