Silverstone Professional 3 Tachymeter is an automatic winding mechanical using the G-1721 caliber which 13 ¼ with Cotes de Geneve and circular graining decoration. With 28 jewels, and runs at 28,800vph, it comes with blued steel screws and is adjustable at five positions.
The functions include hours, minutes, and small seconds at 9. With a second-time zone indicator in the center, it comes with big date with double disc. The chronograph has minute counter at 3 with center flyback seconds and a triple tachymeter scale graduated from 300 down to 20km/h.
The three-piece stainless steel case comes with curved sapphire crystal and has a diameter of 41.6mm. The caseback is attached by 8 screws. In addition, the back is engraved with the royal marine crown.
This piece is water resistant to 160 feet.It uses black crocodile or alligator leather strap with polished and engraved steel buckle.
The black dial comes with luminescent Arabic numerals in hours, minutes and seconds hands. The center second hand comes with red tip and yellow hand for the second time zone.
The triple tachymeter comes with color-coded scale, and finishes with a minute counter. Another version comes with tachymeter scale in miles or in kilometers.
The indications include a small seconds at 9 with big date at 6 and minute register at 3. At the center sits the seconds counter and second time zone. On the tachymeter, it shows average speed per km from 300 down to 20km/h.
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