說到潛水錶，就不能不提一支SEIKO的潛水錶，算是SEIKO的雪恥之作！
1960年代，各錶廠都努力在潛水錶的開發上，當時seiko最丟臉的一件事，正是當時有潛水員，以氦氧混合氣體潛水時，在上升過程中，seiko的錶爆開，從此，各家廠家才開始重視排氦閥的重要！
seiko當然也得盡快血恥，於是在1965年左右，推出了此款的原型，具有自動排氦功能的潛水石英錶！當時鈦金屬還不是普及的製錶材料，seiko已經開始採用這種材質。一體式的錶殼無背蓋設計，使得維修必需從鏡面打開，而整個錶殼是以鈦金屬與石墨製成，強度高，且外圍以耐磨陶瓷披覆，龍頭是以業界最粗的軸來做，從這個設計，看得出seiko的用心與努力！
它的夜光超亮，可以說是目前市面上所有夜光塗料中最亮且持久的！而彈簧棒也是最粗的，可以承受最大的拉力考驗！整體做工細緻，連旋轉外圈也阻尼適中，再加上5年電池、並有電力用盡指示，可是說，完全是一只實用導向的專業潛水錶。
至於排氦的功能，是設計於鏡面周圍的N形膠圈，可以在錶內壓力過大時，自動排氦！當然，要換電池或保養，也得從鏡面了！不過，幸好台灣精工就能處理，所以，可以說是無後顧之憂的選擇！
另外，再提一下日本製的seiko，可以從序號上大約推出它的生產月份，例如錶背序號630109，就是2006年3月生產的第109支錶！而且它的背蓋，還可以刻上下次大約的換電池月份，做為參考，不過自從發明了電力警示系統(二秒或四秒一跳)之後，這刻字的功能就漸漸式微了！
原廠在2006年之後出廠的產品，已經是使用藍寶石玻璃來當鏡面，並且在旋轉外圈上，也披覆了一層藍寶石玻璃，由此可見seiko真的是一個料好又實在的牌子！
相同的機芯，也有排氦功能的設計，但是材質為不銹鋼，且有底蓋的計設，但是價格便宜很多，若是有預算考量，也可以以此為考慮。但是，說到此款，圓弧形的鏡面，是不太習慣的設計，常覺得怪怪的，不過，還真的超像國外網站為它們取的名號：Tuna Can鮪魚罐頭！上面那支黑的1000米，國外叫它Black Monster！
在網路上找到一篇來自於國外網友的評論，非常詳細：Ed's Corner
I love that line from Crocodile Dundee when he says "That's not a watch...THAT's a watch." All right, he may have said knife but if he had a Seiko Tuna Can, he would have said watch.
The Seiko SBBN007 is one of Seiko's Prospex Diver watches. The Prospex models are Seiko's upscale sports watches and the overall build quality, specifications and design are clearly at a much higher level than that of the more common 7S26 powered divers. All it really takes is one look at the SBBN007, nicknamed for obvious reasons the Tuna Can or just Tuna, and that difference becomes apparent. The fit and finish of the case and bezel on the Tuna are clearly a cut above what you find on models like the Monster. (Not that the Monster is a badly done watch at all. It’s a wonderful piece in its own right. The Tuna is just better, that's all).
The SBBN007 is a really massive timepiece. It's stainless steel case measures 48mm in diameter, not including the crown, 14mm in thickness and has a 22mm band lug width. It's crown is undecorated and, not surprisingly, screws down. It has a thick, domed, Hardlex crystal that is screwed down to the watch case for improved water resistance (Hardlex is Seiko's proprietary crystal material that is harder than regular mineral glass and more shatter resistant than sapphire (but not as scratch resistant). The lume is Seiko's Lumibright (Superluminova to Swiss watch fans. The Swiss actually license their lume paint from Seiko.) and lasts a long time for low light viewing (It's not quite in a Monster's league but it is close). The band is a rubber style diver's band, called the Daloaz, that is specially made for this watch, as I understand it. Water resistance is rated at 300 meters, which should certainly be deep enough anyone.
Internally, a 7-jewel Seiko 7C46 quartz movement powers the Tuna. Battery life is rated at five years, which is really quite good. Accuracy, as is to be expected for a quartz movement, is excellent. So far, my example gained one second in the past week. I think I can live with that. The 7C46 is reputed to be a very strong movement as quartz movements go and, unlike many battery-powered movements, actually looks pretty good too. There is even some measure of decoration on this movement, a nice touch in my opinion. Additionally, the case back is inscribed with a set of numbers representing years. A small mark is engraved above the year that the Tuna’s battery should be changed. That is a neat little detail that further sets this watch apart from most others. It even has rate adjuster controls on the movement, not that I have the nerve to touch them.
The one characteristic of this watch that is most striking is the case design. It is essentially made of two main parts, a conventional watch case that holds the movement and an external shroud that surrounds it and is attached by screws. The result is a watch that really looks like a precision tool. The SBBN007 is one of a long series of shrouded Seiko divers that range from a 150-meter non-Prospex model to an all black model rated at 1000 meters water resistance (comforting to know that your watch will still work after your submarine has been crushed by water pressure).
I was very pleasantly surprised by how comfortable the Tuna is. For a really big watch, it does not feel unwieldy on the wrist at all. I think the reason for its good feel is that the lugs are very short. The watch wears closer to the wrist that way. It isn't dreadfully heavy either. All in all, even with its dimensions, it would still make for a good daily wearer.
The SBBN007 is generally not available in the U.S. through regular retail channels. I picked this one up, from a Japanese vendor named Seiya who was very good to deal with. The Tuna Can is not an inexpensive watch (this one set me back $479) but if you are ready to trade up to a higher end diver, I think its well worth it. Between its excellent quality and its striking and unique looks, it is a really exotic piece in my opinion. Seiko Tuna Can's have developed a very popular following and it's not hard to understand why. This model is that well done and I'm really expecting to enjoy it for a long time.
As an aside, if you really want in-depth information about this watch, or any Seiko for that matter, spend some time searching the Seiko-Citizen Watch Forum. There are some very knowledgeable folks over there.
為了讓整體的視覺效果更好，特地找了澳洲的專業錶帶賣家Watchadoo，找到了精工專用的22mm錶帶，加上2.5mm粗的spring bar。實心帶頭加上實心錶節，整體質感不錯，可以參考，畢竟在台灣要買到精工原廠的錶鍊幾乎不可能，加上價格又貴，不如從國外直接買，還便宜得多呢！
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