Seiko SKX009 (7S26-0020) was in production from 1996 to 2019, a run of 23 years, carrying the 7S26 automatic caliber in a 42 mm case rated to 200 meters.
The Pepsi-bezel twin of the SKX007 - same case, same caliber, bluer horizon.
The full collector's file for this reference — variants, dial codes, and the authentication walk-through — is on the writing schedule; the specifications above are the permanent record.
Vintage Seiko divers are the most frankenwatched category in the affordable vintage market. Aftermarket dials, bezel inserts, hands and crowns outnumber originals in the wild, and correct-looking watches are routinely assembled from parts. Before bidding on any reference in this family: ask for caseback and movement photos, check that the serial's production window matches the dial code, and price a full service into every purchase.
Production windows and specifications compiled from documented collector references and period catalogs, cross-checked across independent sources; manufacturer records for this era are approximate by Seiko's own account.