Dozens of curious tourists press their faces against the glass-bottomed viewing wells of a Catalina Island excursion boat, their fashionable early-20th-century hats forming an almost comic mosaic of felt and wool — every single person wholly absorbed in the underwater spectacle below. The Glass Bottom Boat experience at Catalina's famed Submarine Gardens was one of Southern California's must-do tourist thrills from the 1890s onward, and this hand-colored postcard captures the communal wonder of it perfectly. Published by Western Publishing & Novelty Co. of Los Angeles and printed by Theo Sohmer, the card dates to the undivided-back transitional era and was never mailed, leaving it crisp and bright.