What do the size designations mean?

Pocket watches come in various sizes, usually noted as a number followed by an "s." This is a standardized sizing used in the industry, much like shoe sizes. The larger the number preceding the "s," the larger the pocket watch. The size is based on the measurement of the movement inside the watch, and not the watch case. A 18s or 16s pocket watch is a common size for a gentleman's watch. Please visit our size chart to lookup measurements of common movement sizes.