Seiko 5 is the entry level mechanical/automatic watch. Asian watch lovers at a stage or another would definitely have a Seiko 5. During my childhood, Seiko 5 is considered by many as good watches. It built its reputation on cheap prizing, and reliability (acceptable precision and considerable problems free). Another great marketing strategy; unlike Ford Model T, Seiko 5 comes in huge variety of case, bracelet and dial design.
I need to confess, I have quite a number of Seiko 5..... Most , if not all of the Seiko 5 available in South East Asia is what I called K series. For instance this watch, if you are going to buy it in Malaysia and Singapore, you would probably get this model number SNZF25K1. So what is the fuss between J and K? K is designated for watches produced or assembled outside Japan. Seiko 5 usually is assembled in Malaysia, Singapore and China. J stands for Made in Japan edition and is usually for Japan domestic market. You got to hate the Japanese, they usually keep the best for their own countrymen.
From the appearance, the K and the J look alike and without much different. I can tell you for sure, the J finishing is far more superior than the K series.
This watch was bought from a Japanese shop in Singapore. What caught my eyes is the combination of red coca cola bezel and the white dial. On the white dial is the highly luminous dots and hands. At the bottom of the dial for the J series it has "Made in Japan" written-ed Why I declared it as a wrong edition. This is because I have seen this watch before. It usually comes equipped with silver hands to match its dials and silver dots. However this watch comes with a set of black hands. The first photo below is what a normal SNZF25J1 should look like....
This watch uses the 23 jewels 7S36-03C0 movement. The case, the crown and the bracelet is all stainless steel. The case is 38mm excluding the crown and it is with a see through back case. The front is using Seiko Hardlex Crystal. The crown is a simple push in type. For a diver watch, I would expect a minimum standard of screw in crown. The bracelet is pretty impressive; it is a stainless steel with folded double push buttons signed buckle. On personal note, this watch looks somewhat like Rolex Submariner.