One gap that I was aware of in the Movement Table was for the 520 Auto Dater. Although I had seen examples of this model, I hadn’t got my hands on one, nor had I seen a detailed shot of the movement – so I couldn’t be absolutely sure of where it would fit. I presumed it would be related to the 540 Auto Dater, which is a date only model from the movement family used in the Crystal Sevens. The 540 seems to pop up a little more often (or should I say a little less infrequently!) and I had acquired one a little while back, and show briefly in this post: https://sweep-hand.org/2011/11/06/the-5400-autodaters/
So I was pleased to find a 520 recently, and I have now been able to add it to the Movement Table:

As expected, the 520 is ‘named’ after the movement it uses, and is a day / date model. Again this is as expected, since Citizen’s convention in their movement numbers is generally (but not always!) to use the first number ‘2’ (i.e. 5202) to indicate a day and date watch, whilst the first ‘4’(i.e. 5400) indicates date only.
I’m not sure whether anything other than 21 jewels were used in this movement, although I know the 5203 also came with 23, 27 and 33 jeweling – perhaps they were reserved for the Crystal Sevens. The movement hand winds, but no hacking, and has quickset date with the crown pulled one step out. Day is set by winding back and forth between 12 and 9 o’clock:

And here is the movement number, 5203, stamped in the usual place:

So this movement is the same one found in some of the Crystal Seven models – but since this watch is a plain 520 ‘7’, then I presume it lacked the hard mineral glass used on the ‘Crystal’ versions. But it still has nicely finished hour markers at 12, 3, 6 and 9 o’clock positions:

With the transition from the thicker ‘jet’ movements to the oscillating weight type, the 520 is a fairly slim model:

The back is typical of its day, showing October 1966 production (I guess production was started in 1965, as for the Crystal Seven) :

Finally, the fluted bezel design as was often seen in the mid 1960’s:













(image courtesy of Citizen Japan)























