File:Sinn 303 M.jpg Sinn 303 M km-h
File:Sinn 303 M Silber.jpg Sinn 303 M-mph Silver
File:Sinn 303 M RS.jpg Sinn 303 (back)
303 M is a model railroad chronograph by Sinn.
The tachymeter of this chronograph is matched to a model railway. Thus, the speed of a fast model ICE can be measured as exact as that of a historic steam locomotive. A sympathetic additional function, that makes this watch an original and personal property of every true model railroader.
Variants: With mph classification and date in the English language; with
guilloché, galvanized silver dial.
chronograph movement Valjoux 7750, 28.800 A/h
Nivarox 1 hairspring, Glucydur balance wheel, Berylium plateau
Antimagnetic according to DIN 8309 Shock proof according to DIN 8308
Stainless steel bracelet, DIN material No. 1.4435, polished, tachymeter ring satin-finished Ø 41 mm, height 16.5 mm
Sapphire crystal, with anti-glare treatment on the inside
Sapphire crystal caseback with printing: measured sections and standards (Optional:) Dehumidifying technology by filling the case with noble gas argon and patented dry capsule
Screw-in crown with double o-ring gasket, with crown protection Pushers with double O-ring seal and pusher protection
Waterproof to 200 m Safe below atmospheric pressure
Black mat or silber
Guilloché and elaborate silver galvanised dial Indexes coated with special long-lasting, luminous paint, fine minute scale
External tachymeter scale ring with colored engraving
small seconds with hacking seconds Date and day of week indication in German (km/h) or English (mph) at 3 o'clock
Chronograph: 12 hours counter, 30 minutes counter, 60 seconds counter
Tachymeter scale for speeds (400 to 2 km/h or 250-1 mph)
Black Russia leather strap
Variant: with massive stainless steel bracelet and milled folding clasp and 30 mm overall extension
2 years (with Ar dehumidifying technology 3 years)