I sent it to be repaired to CSA and they tell me it is not high grade water resistant, but I have always worn it in water and it never leaked. The Model on back is and on the face is AD. The x series are generally well liked by most Seiko dive watch collectors and a Pepsi-bezeled F can fetch between USD to USD depending on the condition and originality. You can also view the entire datefinder database. Perhaps a US entrepreneur imports for export but not for the US market?
Long time no speak.
Seiko Date Finder
Incidentally, do you think Seiko solar is superior to Citizen Eco-drive? I might buy one of those nice Seiko Solar chronographs this year. What you see here is in large part thanks to this excellent Quartzimodo article How to tell when you Seiko watch was made. Comment by Quartzimodo Admin on March 8, 1: Comment by berry on June 25, 1: