Do you have a reference for the dial type numbering scheme? For me, this is a later style Challenge diver dial, correct for a 21j 52-0110, but later than dials for 62-5370/B52806 or 62-6198.
https://vintagecitizenwatches.com/2015/03/08/citizen-diver-150m-52-0110-dial-variants/
- 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.
OK, so this is only with respect to the 52-0110, and omits the earlier dial styles. In my photo, Type 1 is at far right and Type 2 is second to right. The the two other watches I showed are also 150m Challenge divers and have different dials. The first, at far left has no lume plot to the right of the date window. And the second (62-6198) has a fully framed lume plot that is separated from the date window. Four totally distinct dials. 😀
U know if u drop him a message he responds to questions. he very well informed and knowledgable about Citizen watches
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