Good explanation from another site: "
So, the watch.... Its a all Diashield ( hardened coating ) Titanium Cal 7T62 Seiko Bullhead Chronograph designed by race car aerodynamicist Takuya Yura, in 2004 he designed this watch as a celebration of Seikos 40th anniversary of its Chronograph.
It has a screw down crown and is 10 bar water resistant, its party trick however is in its hinged lower section that when unlocked allows the watch head to flip up out of the case about 60 degrees to allow access to the bullhead configuration start / stop buttons and crown , these buttons cannot be accessed without flipping the module out, to do this the fluted bezel is turned a quarter turn clockwise to unlock the mechanism and then reverse that to lock it again. The bezel action is amazingly smooth and 'right'
Its a large watch being 45mm across the case and has a 22mm non integrated solid link Ti bracelet with flip lock clasp , the links of which use Seikos infernal pins and collar system.
The caseback is nice, it has Takuyas signature and the serial number but interestingly not a Seiko dating serial number, but we know they were all made in 2004
The crystal is Sapphire.
The package is nice as well, a Prospex 'Speedmaster' box , so Seiko actually called this a Speedmaster, its not a nickname. it also has a card printed with a kind of blueprint skeleton image of a race car and of course the handbooks etc.
This example is amazingly 'as new', not a mark on it anywhere, this must mean it has hardly been worn or the Diashield Ti treatment is very robust, I suspect a bit of both.....
One interesting observation a friend of mine made, when he saw the lugs he commented that they looked like the uprights on a race cars suspension setup, a bit of Googling and you can see what he meant, Im sure that this was intentional on Takuyas design but not a fact that many people would spot unless you were familiar with a race cars components."
Click to expand...