The Keystone Lantern Company produced lanterns from 1903 to 1930 so any Casey model has to fall within that range. Often the lantern body is unmarked, but the globe is marked Casey. The most common Casey lanterns seen are with a round wire base, but they did make bell bottom designs. The Casey can be found with both flat and round verticals, and has one horizontal guard. Caseys appear to have been designed to use extended base globes, but many have been found with Corning style globes instead.
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Below are some images of Keystone Lantern Company “Casey” Model Lanterns: