Great Genuine Seiko Ratcheting Clasp!
While this clasp is specific to only a few Seiko watch models like the MM300 and the Velatura, it will also fit other Seiko dive watch bracelets.
In my case, I installed it on my Gen. One Orange Seiko Monster watch replacing the folding dive extension.
It was a drop in replacement! Two spring bar pins were removed to swap out the original folding diver extension with the ratcheting clasp. Perfect fit!
Adjust on the fly for daily wear, wrist swell, over an outer garment, over a dive suit or neoprene cuff of a cold water wading jacket. very easy to adjust.
This should be a standard or optional clasp for all Seiko dive watches. I will be buying more and replacing or adding this dive extension clasp on my other Seikos.
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