It's great information to know and I appreciate that he has agreed to pass along this great resource. Little information is stamped on the back – typically it may relate only to the case back material:Īfter reading this information at Alain's forum, he graciously offered to let me repost this information here at WatchFreeks. 10-13: Stainless steel CC: Watch diameter size in millimeters DD: Type of Movement. Case serial numbers.While Omegas reference numbers start somewhere in the 1930s, they were usually not placed on the watch itself until the mid-1940s. More on that later.īefore covering the three basic designs, a word about the very early models. 123: Constellation BB: Housing Material and Strap Type.

The late 1950s also saw the introduction of serial numbers, which are very useful to us of course, because we can determine the date of production. I have identified three core formats, and I’ll show these in the following sections, along with some of the variants that can be found – one of the joys of this for the collector is the variety of case backs that occur as result. Each of these used various case designs, with different case materials, and the case back markings began to reflect this. I’ll cover special case backs on a separate page.Īfter the very early models using the ‘F’ type movement, Citizen began to develop a wider model range and towards the end of the 1940s and particularly in the 1950s a number of models were in production. This page attempts to show the basic types and how to interpret the information that case backs give – often crucial to determining the authenticity of the watch. How long is my warranty How long is the warranty on my. empty How do I register my watch Why doesnt the Citizen app recognize my watch I purchased in the USA but live elsewhere.

Over the years Citizen have changed their watch case back markings, whilst they have also used special backs on their high grade watches and certain specific models. How do I find my watch caliber number Is it safe to turn the crown backwards to set the time B620 Manual See all 7 articles Warranty & Watch Registration. This information will be helpful for folks looking to decipher the model numbers and other caseback markings!

Decode citizen watch serial numbers