Apple - How can I tell what model Apple Watch I have?

$22.50

$7.87

$35.00

$12.25

$39.00

$13.65

$24.50

$8.57

$14.50

$5.07

$19.50

$6.82

$12.50

$4.38

$12.50

$4.38

$39.00

$13.65

$25.00

$8.75

$22.50

$7.87

$12.50

$4.38