The basis of judgment is: if the watch has a second hand, it means that this is Cartier blue balloon series.
W6920046 automatic mechanical watch of Cal.076 automatic winding mechanical movement, but your watch is not marked with the word automatic above six o'clock. See chart.
Without automatic, it should be W690 1 1Z4 quartz watch, but the genuine quartz watch has no second hand. See chart.
Except that the overall workmanship is obviously too rough, there are two places that can prove that this watch is a high imitation watch. One is that the time scales below two o'clock and four o'clock are different from other time scales and should be the same size. The other is the fixing screw on the back cover of the watch. I only saw four of your watches, but there are really seven. See chart.
To sum up, you can be sure that this is a Cartier watch with high security.