The SPB line in Seiko?s Prospex collection needs no introduction, and to many it represents old-school Seiko excellence: historic design with modern specs at reasonable prices. In particular, the SPB143, 145, and 147 are especially beloved thanks to their wearability and 62MAS lineage. Seiko is now introducing three new U.S. Special Edition models based on that reference, each corresponding to a cold-water American diving locale.

The SPB419 makes the biggest statement of the three, and its striking gradient dial is intended to invoke the northern Great Lakes? blue ice, notably in Michigan. A rare natural phenomenon, this blue ice is achieved when sustained temperatures allow water to freeze and thicken over long periods of time. When light then hits the ice, the red part of the light (i.e. longer wavelengths) are absorbed while shorter blue wavelengths are transmitted. This seldom seen sight is truly something to behold, and Seiko captures its essence here.
The SPB421 and SPB423 take us from the Lakes to Alaska where we meet a different type of icy structure: glacial moulins. Also known as mills, moulins are well-like structures that form from weaknesses in the ice and can sometimes reach hundreds of meters to the bottom of the glacier. The SPB421?s dark blue dial with a subtle gradation captures the ice?s color at depth ? you know, in case you haven?t seen it yourself, while the 423?s dial is meant to evoke the light gray tones of glacial ice as a whole.
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