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USS Constitution. The earliest stamps simply depicted busts of reigning monarchs, important figures, or coats of arms, but as time went on stamps started to have a wider range of designs. Bears appeared on provisional stamps of St. Louis in 1845, while the beaver was featured on the earliest stamps of Canada. More than 150 years later, the variety of designs on stamps is enormous, giving topical collectors plenty of scope to find stamps for their chosen theme. In fact, so many stamps have been issued that some popular themes, such as ships or birds, have become nearly impossible to complete, and topical collectors may specialize further, such as by looking for only square-rigged sailing ships, or only flightless birds. == Collecting ==