The largest group of Citizen divers is the 150m one. It has a classic design and a gorgeous look. They had a production time span of about 15 years, powered by a handfull of movements. The last model was the one in this article, the 52-0110. Even if this is one model it had a few variants. I saw only black dialed versions and a rare orange dial one. Stephen on his page suggests it might have had a blue dial too. http://sweep-hand.org/citizens-vintage-divers-1962-to-1980/ I have yet to see one to confirm that.
No matter the color, we can see two design variants, one prior to 1978 and one after 1978. I will call them “type 1″(8210 820719-S) and “type 2” (8210 824391 KA). The dial code is printed on the dial at the bottom of 6 o’clock. I am lucky enough to have both of them. Let’s see the picture that can be magnified them for better understanding.
My type 1 was made in ’77 and type 2 in ’78. The case is the same, the crown, crystal, bezel and movement are the same. Both powered by the well known Citizen cal. 8210, 21.600bph, quick set date, non hacking seconds.
The main difference is the dial, and the way the hour markers, the logo and the date frame are made.
- Type 1 has the letters of the Citizen logo separated while type 2 has all the letters connected in an applied logo.
- The date window on type 1 is connected with the lume frame. By contrast type 2 has two distinctive parts, date frame, and lume frame.
- These is due to the way Citizen chose to manufacture the dials. Starting from ’78, on type 2, they decided to apply these elements, and so they did. They made the dial, painted it, printed the white lettering and the minute markers and later applied the logo, the date frame as well as the hour markers.
- In type 1 (prior to ’78) we have a unibody dial, made in one piece containing the logo, date frame and hour markers. After painting and printing it Citizen polished the surface revealing this look.
- Under magnification the main difference is easy to spot: Type 1 has polished elements with only one metallic surface appearance while type 2 had these elements polished on the sides too. This is because they were never painted. On type 1 we can see the black paint on the sides of the logo, date frame and hour markers.
With Citizen most of the times the look of a watch is dictated by the manufacturing process and so is the case with these dials too.
Read more about this model here: https://vintagecitizenwatches.com/2013/12/24/citizen-automatic-diver-150m-52-0110/