The omega Air-King came about as a response to the popularity of larger cases with legible dials. Air-service men and women, especially in the RAF, would often opt for 33mm omega Oyster watches. Don't get me wrong 33mm watches are practically diminutive these days, but back in the 40s, this diameter was considered oversized. Therefore, the continuation of this diameter became inevitable.From 1957 to 1990, the omega Air-King reference 5500 was in continual production. The Air-King may not have had chronometer certification but the cost-effectiveness certified it as the entry point into the Coronet. During this time, it was typical for omega to partner with firms to gift Air-Kings to employees...