Algunos logos de SEIKO
Daini - The double-triangle/Lightning-Bolt means Daini - today's SII (Seiko instruments).
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Suwa - The Swirl means Suwa - today's Seiko Epson.
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Extra Dial (ED) - The four-pointed star is Extra Dial (ED). As there are also watches without any logo, I assume this is at least one step up from standard.
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Applique Dial (AD) - The 3-pointed star inside a triangle stands for Applique Dial (AD). This is usually on high end Seikomatics and similar where the Seikomatic logo is applique rather than printed on the dial. (Pic from the Seikomatic Archives).
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Special Dial (SD) - The eight-pointed star is Special Dial (SD). This is also on high end watches but with printed dials rather than applique. (Also Seikomatic Archives)
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Elnix - The snake with the arrow-head.
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Seikomatic - A spinning top / ballet-dancer..
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This is the fancier applique version of the Seikomatic logo:
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and here is the simpler, red colored version used in ladies watches:
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Advan - A stylized sun.
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Gyro Marvel - A circle and arrows or another rendering of a stylized spining top.
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Finally, there are a few modern ones (I will skip GS, KS and SQ as you know what they mean already)
The W with small roof is single crystal quartz:
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The VVV with double roof is double crystal quartz. (should be turned 90 degrees):
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Auto Quartz:
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Electronic:
Kinetic:
This logo was used on some 4Sxx watches: