El Curandero Gallery, located in La Antigua, Guatemala, looks like a good source for Guatemalan masks, wooden figures, slingshots, ceramics, paintings, and textiles. Among their current listings are these two Maximon masks. The one on the left dates from the 1950s and the other from the 1940s.
Maximon is an auspicious folk deity best known from his cult at Santiago Atitlan. He apparently blends aspects of the Christian Saint Simon with a Mayan god, perhaps Maam, an underworld god. I photographed a Maximon altar in Antigua a few years ago, and posted information about Maximon on that page.