Sinn 303 M

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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)

The 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.


Mechanical 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


Hours, minutes, 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)