Some call it the "calculator" but I prefer the name "slide rule" to refer to the Seiko 6138-7000 chronograph. I deliberately included the adjective 'complete' in the title of this post as this watch has all the parts including the hard to find cursor. I previously wrote about a Seiko slide rule I acquired in 2021. That lacked the cursor and was a little more beat up than the one I more recently acquired.
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The 6138-7000 features two chronograph registers/sub-dials, day and date complications, rotating outer bezel and a cursor fitted around the crystal.
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Side view showing the crown and chronograph buttons
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The other side view
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The back shows the model and serial numbers. The serial number indicates this watch to be older than my other slide rule - July 1974.
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Close-up of the dial and bezel
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Close-up of the relatively pristine dial and hands
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Lume shot for the watch. The watch has not been "re-lumed" so this is a good thing considering this is a 48-year old watch.
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Wrist shot
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My two 6138-7000 chronographs.
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Here's my first wrist shot of 2022.
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This is a big watch and perhaps among the biggest in my collection. The biggest might be the vintage Molnja that was originally a pocket-watch. This Seiko chronograph is also a grail piece for me, very rare, and in this condition can easily be in the 1,500 to 2,000 USD price range.
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