I used to own the highly regarded JDM Marinemaster 300. It is a very nice watch - but this MM600 has many upgrades and is a step above the venerable MM300. The upgrades include all-titanium construction, sapphire crystal, increased water resistance, the GMT function, and the Spring Drive movement. All of these upgrades combined make the MM600 my ultimate dive watch.
First, I love the size. It is large and in-charge! Yet, the titanium gives this large watch a very reasonable weight, around 165 grams or so. It is beautifully crafted, the bracelet is a work of art. The "sawtooth" bezel looks very very cool, and is very smooth turning. The dial is beautiful, and the lume is unbeatable. The Spring Drive movement is a thing of beauty, and results in an absolutely smooth-sweeping second hand. The 72-hour power reserve is very nice, and the accuracy is impeccable. Mine is running at about +8 seconds per month.
One other thing I like... Since this MM600 is sold in the U.S., it can be serviced in the U.S. by Seiko -- unlike the MM300, which must be sent to Japan.
All in all, I am extremely happy with this watch!! AZ Fine Time offers it at a great price!! I'm so very glad it is part of my collection. Joe
14th Apr 2018
A very fine watch
You have to be into Seiko engineering to appreciate their high end divers watches. I am, so this is a biased review. Think about how many other 600 meter dive watches have a helium escape valve. Not this one, because it’s engineered not to need one. It’s spec is +/- 1 sec per day. No way, I’m getting 5 seconds per month. Much better.
These folks are authorized Seiko dealers so you get all the warranty documentation. My buying experience was very straightforward. This is the best price you are going to find for this watch, believe me I’ve searched everywhere
Love this watch, great customer service, best price. Unknown
3rd Feb 2018