Casio AQ-S810W
World Time, 5 Alarms, Timer, Stop Watch, Timer, Oct. 2013

The Casio Module 5208 and the model AQ-S810W
are useful information on the case back. I have checked, the 4 screws that hold the case back in place are not connected to the four screws on the front of the watch. A water resistance of 100 meters is very nice for a watch at this low price. The pushers are wide and have a nice springiness. And again, for an inexpensive watch like this, the button action is very nice.
At the right bottom lug you can see the shoulder of the spring bar that holds the strap in place. 005A204C seems to be a laser etched serial number. The other inscriptions are stamped.