In the ‘comments’ section of my last post (‘Best laid plans and all that’) Pom asked about a twin crown diver he has, and whether it is a genuine model, since he hadn’t been able to find any information about it. From his description and dial photo I was pretty sure it is the genuine article, and after seeing a photo of the back I am even more sure. Here are links to the images Pom provided:
This is a rather rare twin crown diver, but I have seen one or two of them, which helps to confirm its authenticity. They date from the late 1960s, and as far as I know there were three models, all using the 21 jewel 5270 movement running at 18,000 beats per hour.
Pom’s watch has the case code of 4-520017, and closest to that is the 4-521315 but has the winding crowns in different positions. The other model is the 4-520343 – this one is seen a little more often, but also came with different coloured dials and has a different inner bezel ring.
Here’s a slideshow showing examples of the three, first is the 520017 for Pom to compare with his, then the 521315 (with due credit to the sellers for the pics) and my own red dialled version of the 520343. Click on an image to start the slide show:
There’ll be more on these and Citizen’s other vintage divers in the diver article I’m working on 🙂
NB: I have previously referred to this model as a ‘compressor’ model – however I am now aware that this is not correct, so I have edited this post to reflect that and refer to it as a ‘twin crown’ model. See this post for more information: https://sweep-hand.org/2014/05/01/citizens-so-called-compressor-diver/