The ETA/Valjoux caliber 7753 is an automatic cam type chronograph movement. This movement is from the same family as the caliber 7750.
7750 vs 7753
Visually (from the dial side) you should be able to tell the difference based on:
Chronograph subdial counters located at 6:00, 9:00 (small seconds location), 12:00
Day/Date at 3:00
Chronograph subdials are at 3:00, 6:00, 9:00 (small seconds location)
Date at 6:00
Mechanically you can differentiate between the two movements based on the setting of the date. The 7750 date sets by the crown, the 7753 set from a 3rd pusher. If you’re able to see the movement, but cannot see the caliber number stamp, remember that the 7750 has 25 jewels and the 7753 has 27.
The date is typically adjusted by a pusher at 10:00. Some watch brands that use this movement opt to not include the pusher in their designs – this could be for water-resistance issues, etc. For example, Breitling labels the ETA 7753 as their caliber 23, and when used in the SuperOcean Heritage, it does not have the calendar corrector.