Citizen’s second generation Jet movements, the 41xx series, were launched in 1964 and were used in the ‘Seven’ auto dater models. They were made with 19, 25 or 35 jewels and a ‘Monthly’ model was part of the line-up, but they were soon superseded by the newer models using swinging weight movements. NB: There is also a ‘7’ in the ‘SM’ line-up, but this used the 23 jewel 4600 movement, one of the first of the swinging (also known as oscillating) weight rotors – so it doesn’t have a Jet rotor.
This week’s example is one of the 25 jewel variants which uses the 4101 movement (see the Jet Automatic page for more detail on the movements used – https://sweep-hand.org/the-jet-automatic/). The dial has the applied ‘7’ logo, not found on the earlier 03/11xx models:
Typically marked ‘Parawater 40m’ the Sevens all feature separate date and day windows, and I believe they all have a date quick set mechanism, known as Easy Change (EC). This is activated by repeatedly pulling the crown out to its last step and then pushing it back in. The day is set by winding back and forth past midnight then back to around the 8 o’clock marker.
The font used is distinctive, whilst the stylised Jet motif has been dropped:
This model has a one-piece case, with typical markings on the back, showing production in November 1965. The case number is the older type (ADSS81302Y) and the case back sticker is still in place:
The same font and ‘7’ logo are used on the back:
For more information on the Monthly model see this post, where it is shown after its successor model: https://sweep-hand.org/2011/05/20/this-weeks-featured-watch-4-the-monthly/
Sweephand's Vintage Citizen Watch Blog 
I have a CitizenAutoDater Parawater 25j “7” Star CGP, and the stem has come loose, well actually only the cap. How do I fix it without ruining the watch, or who can I get to service the watch. Locally, I was quoted $225.00 to just look at it and that involved sending it to Philadelphia, PA!. Kind of pricey for a watch that I paid less than $50.00 for, but which i love to wear, it just feels and looks so good!
George
Hi George, thanks for visiting my blog. The re-fixing of the crown is an easy thing to do, providing it has simply come unscrewed (which can happen) – however if the threads in the crown and/or on the stem have worn out then it isn’t going to screw on tight so a new stem or crown will be needed. Having said that the $225 you’ve been quoted is a ridiculous price to pay to ‘have it looked at’! Walk well away from that.
The problem with vintage Citizens is the (lack of) availability of parts so that will be a possible stumbling block if the level of wear means the crown won’t go back on nice and tight. If you are confident about doing it yourself, then it isn’t a difficult job. The main thing is that you’ll have to get the case back off, and a tool is needed for that – they aren’t expensive though. Let me know if you want to have a go, or at least want to know what to do, and I’ll take you through it. Also, I’m interested to know what model you have – can you tell me what the case back tells us? i.e. model number (xx-xxx) and case number (4-xxxxxx)
Stephen
Hi Stephen,
My watch is already on your site, posted June 17, 2013, the gold watch! It keeps very good time, and with the grime on it when I got it, I doubt that it has ever been cleaned or serviced! I have the tool to remove the back, and I am ready to attempt this repair! I really like the feel of this old watch and I appreciate the help! Thank You…
George
Hi George – ah right, sorry I hadn’t remembered. Unfortunately the blog/comment format doesn’t make it easy to track things, unlike you can on a forum thread. I’ve found the pics you sent me 🙂 When you asked about the repair to your watch, you described it as a ‘7 Star’, so I thought it was a later model than it actually is. Yours is an Autodater ‘7’, with the ‘jet’ rotor. I’m pretty sure that the procedure for stem removal is the same, but I want to be absolutely sure, so I’ll take a look at one of mine (and take a pic or two). I should be able to do that tomorrow…er…later today 🙂
Stephen
Hi George, I’ve just done a quick post on removing the stem from a Jet Autodater. Please note that the stem should be in the time setting position before you try to pull it out when the release button is pressed.
Good luck with it and I hope the crown will refit correctly.
Stephen