Citizen Chrono Master Superior Chronometer Special Auto Day Date 35 Jewels 4-521421Y


This is a long title for a watch, isn’t it? 🙂

Citizen Chrono Master Superior Chronometer Special Auto Day Date 35 Jewels 4-521421Y

I am not sure how to write this article yet: should I say a lot of words about this marvelous piece or let the pictures and the title say it all? Here it is the way it looks, as always the face of the watch, the case back and the movement. The watch is on original Citizen Chrono Master strap.

citizen chronomaster superior chronometer special

I always loved automatic Citizen Chrono Master and decided to find the best of the best out of the dress line. I also wrote about the non date one, date or day-date. Some of them are Chronometer some are not. Read about them on the dedicated page HERE.  At the finish line I realized that it is impossible to declare a clear winner.  I had to chose between this one I am writing about now and the blue dial Elite Special that you can see HERE. Both winners. Obviously, you can’t ever go wrong with any Chrono Master. 🙂

Back to the watch: It is the usual fully polished stainless steel multi faceted case and gold inlayed screw in case back. One thing about this one that makes it a little more interesting is the fact that the lugs distance is 18mm so it is supposed to be on strap only, not like most of them that are 20mm. I find the 18mm more suitable for the shape and design of the watch when it comes with a strap. More elegant. It is ok on 20mm but 18mm seems to be just perfect. You can read about the original strap HERE.  The crystal is different a little bit too,  in the way it connects with the case, so not all Chrono Master crystals are interchangeable. It is a mineral one, slightly domed, that comes attached inside a steel ring making these parts a single piece.

The dial is gorgeous, silver, with a sun burst pattern. It has an oval day window at 12 that shows the days only in Japanese (Sundays in red and the rest in black) and a date window at 3. The hour markers are applied and match the hands perfectly. (polished with a central black line – on 12 there are two lines-) No luminous material was used. It was not needed. The legibility is excellent. The inscription on the dial is printed in black and it may look crowded but it is so small and delicate you can hardly notice it unless you want to. And why wouldn’t you stare at it? The silver Citizen logo is applied under the day window and the gold plated eagle logo at 6. One gold eagle on the dial, one gold eagle on the case back. (pay attention that only Special edition are having the gold dial eagle, the rest are silver)  A special Chrono Master indeed! Yes, the case back… it doesn’t get better than this! That gold inlay is a piece of art by itself!

In between the dial and the caseback we have the movement. The in house (like all Citizen) calibre 5250, 35 Jewels, running at 18,000 bph. What about it? Well… Chrono Master Superior Chronometer. Hacking seconds, automatic, hand winding also possible. Quick set date.

At the time it was the most expensive one at 39000 yen while the 33J day date chronometer was only 29000. Even my Holly grail watch, the 500m diver was cheaper, at only 35000. Find one today at this price! LOL!

So… I guess there is a lot to say about this watch, but I will stop here for now. Feel free to leave your comments below!

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Citizen Chrono Master 4-520840-Y and ACSS2929-Y


I am going to keep this simple. This is a picture with two similar watches. In fact it is the same model, Citizen Chrono Master Chronometer Auto Day Date 33 Jewels. It is a long name, but what a watch! The different aspect about these pieces is that one of them is marked 4-520840-Y and the other one is the ACSS2929-Y. Why? Because one is a few months older and the Citizen used ACSSxxxx and the newer version was renamed 4-xxxxxx. (thanks Stephen for the clarification) 

citizen chrono master chronometer auto day date

The case is exactly the same, entirely polished stainless steel, screw retained case back with the awesome gold eagle inlay medallion. The mineral crystal is slightly domed with a concave inner surface. The crown is signed “C”. The movement is the Citizen calibre automatic 5240 with 33 jewels, beating at 18,000 bph and can be hand winded too. In this case the watch is Chronometer grade but the case number is correct for day date version, Chronometer or not. The lug distance is 20mm and they came either with a mesh bracelet or with a leather strap.

One more difference on these two watches presented here is the dial code, even though they are exactly the same. The hands are the same and so is everything else.

Read more about the regular Chrono Master Auto Day Date (not Chronometer) HERE.

Citizen Chrono Master Auto Day Date 5240


“Citizen Chrono Master”, what a beautiful sound!

This is the Day-Date automatic version,  ACSS 2929 Y GN2.  It is made in a stainless steel case with a screw in caseback. On the caseback the eagle medallion gold inlay proudly proves the high grade of the watch. The case finish is superb, having clean lines, angles and polished surfaces.

citizen chrono master auto day date

The movement is the Citizen calibre automatic 5240 with 33 jewels, beating at 18,000 bph. It can be hand winded too. Chronomasters can also be a date only or even no date. There are some Chronomaster movements adjusted to a higher precision called Chronometer. This was possible by the adjuster positioned on the balance.  It is a quick set date, and it hack for better time setting. The day changes by advancing the hour hand past midnight.

Some of these watches came on leather straps, others on stainless steel mesh bracelets. I have yet to find a real one on bracelet. The one presented here was made in 1968 and back then had a price list of 28,000 YEN.

Read more about Citizen Chronomasters here:

https://vintagecitizenwatches.com/chronomaster/