This is a comprehensive operating manual for OMEGA Speedmaster watches with calibre 1109, 1111, 1120, and 2500. It contains detailed instructions on how to operate and maintain your OMEGA watch, including how to wind the watch, set the time and date, and use the chronograph function.

In addition to the step-by-step instructions, this manual also includes important safety information and a troubleshooting guide. Whether you're a seasoned watch collector or a first-time OMEGA owner, this manual will ensure that you get the most out of your watch.