The birth of the “crownless” Omega was based on the watch company’s belief that time adjustment will be rare for quartz watches due to their accuracy.
A small recessed button replaced the position of the crown and time adjustment can be made by gently pressing it with a blunt tool.
To advance a minute:
Gently press and release the button.
To advance an hour:
Press and hold for 3 seconds.
To advance multiple hours (Only works on selected calibres):
Press and hold for a longer period of time (Only works on selected calibres)