So-Called Dollars refer to a category of commemorative medals that resemble coins but were not issued as legal tender. The 1917 "One Dollar" So-Called Dollar is part of this series, often associated with events, people, or significant milestones in American history. These pieces were designed primarily for collectors and can vary in materials, designs, and mintages, contributing to their appeal among numismatists. Collectors value them for their historical significance and artistic merit.