The second is the Emperor Tuna, aka the "Hockey Puck", SBDX 011. This is the big bad daddy of dive watches....
The movement is also an 8L35, the undecorated version of the 9S55. See the following article,
https://wristreview.com/seiko-marin...r-sbdx011-the-benchmark-for-all-dive-watches/
"One of the documents that came with this watch highlighted the caliber of the movement used in this model. The 8L35 in an automatic, windable and hackable in-house movement by Seiko. Using 26 jewels, operating at 28,800 bph and a power reserve of 50 hours, this movement is one of the top line movements that Seiko reserve for only its best models, namely the Grand Seikos. In this particular case, the SBDX011 is deemed to be Seiko’s best-in-class, hence it’s right to use the 8L35. In fact, the 8L35 is an undecorated variant movement similar to that of the 9S55 Caliber.
Seiko claims the watch is +/- 10 to 15 seconds a day but as in most cases, Seiko’s actual accuracy is better. In a number of reviews made about this watch, the accuracy of +/- in seconds should be measured in months instead of days. For example in an August 2008 article by
Ariel Adams, he said the 8L35 has been better than even chronometer ratings with accuracy clocking in at +/- 10 to 15 seconds a month. In another article written in February 2010 by
@bigrustypig, he mentioned accuracy of +12 seconds per month."
See also the following article:
https://www.fratellowatches.com/seiko-prospex-marinemaster-1000m-sbdx011-the-hockey-puck/
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