Models:
Seiko is marketing so many styles of the 7S26 divers that it's hard to keep track of all the variations. But the basic 200m diver that replaced the 7002s maintain a similar look and feel to classic divers in the 6105-6306-6309-7002 lineage. The most commonly seen are the following models:
SKX007K (7S26-0020, round markers)
SKX007J (7S26-0020, same as SKX007K but with extra text on dial)
SKX009 (identical to the SKX007 except for a blue-and-red bezel)
SKX011J (7S26-0020, SKX007J styling, but has orange dial and gold letters on bezel)
SKX171 (7S26-7020?, has a different bezel design than the classic models)
SKX173 (7S26-0029, rectangular markers)
SKX175 (7S26-7029, like the SKX007 but with a blue-and-red bezel)
SKXA35 (7S26-0029, identical to the SKX173 except for a yellow-dial)
SKX779 (7S26-0350, new design -- thick case, scalloped bezel and redesigned dial)
SKX781 (7S26-0350, same as the SKX779 except it has an orange dial)