We are proud to offer you this Vintage OMEGA Speedmaster Ref. CK2998-61 in stainless steel on a brown leather strap with original stainless steel pin buckle. The outstanding feature of this watch is the dot over 90. Also known as DON in collector circles. This OMEGA Speedmaster Ref. CK2998-61 comes with: - Certificate of Authenticity - Omega Box The OMEGA sports chronograph “Speedmaster” with a diameter of 39 mm and caliber 321 (Ref. CK 2915) was introduced in 1957. It was advertised as a “new type of chronograph with tachymeter and production counter, developed for research, industry and sport”. The model was revised in 1962 with a new reference number (ST 105.002) and a new bezel metric that included tachymeter, pulsometer, telemeter, telemile and decimal places. From 1963, the case was enlarged to 42 mm. The "Speedmaster" series is now an important pillar of the OMEGA brand. Various special editions are released regularly. Comes with a one year warranty through our watch lab. - We buy watches since 1991. - -- All offered watches are on stock in our store -- ---