YYZ, Wherever XXX suggests the movement, YY signifies the situation or product, and Z indicates the case product. Again, letters can be added on the suffix to speak extra specifics of the dial. In 1892 they released the whole world to the minute-repeating watch—the 1st of its sort. In 1894, https://www.watchesworld.com/a-history-of-watch-reference-numbers/