Citizen auto Dater UNI – ADUS31201-T


It may not be a real diver but what a gorgeous watch it is! It was made in 1964, just 5 years after the introduction of the first Japanese water resistant watch, the Parawater, and about one year prior to the first real diving watch made by Citizen.

Let me introduce to you the Citizen auto Dater UNI reference ADUS31201-T

citizen autodater uni

The main feature of the watch is the fact that it is a twin crown, similar in appearance with a compressor. The upper crown, located at 2 o’clock, operates the inner bidirectional rotating bezel. By contrast, the lower crown located at 4 o’clock winds the movement and sets the time. The case is made entirely in polished stainless steel and measures about 38mm. The Tropic strap is 18mm at the lugs end and is secured in place by pins that can be easily removed due to the holes in the lugs (a feature that I like a lot in vintage watches).

The domed acrylic crystal protects the beautiful face. The dial is silver, having a sunburst effect. The doubled hour markers are polished and applied. The black elegant lettering are printed and so is the “40M” blue para water feature. The dauphine hands are polished and the hour and minute one have a central luminous part. The inner black rotating bezel has white printing and luminous material markers. On the dial itself the hours are marked with luminous dots too; all except the one at 3 where the date is. The date window has no frame but instead a beveled edge. The dates are printed in black on a white date wheel.

citizen uni cal 2400 auto dater

The snap in case back is engraved “Para water, ¬†Star, SS, Citizen auto Dater, UNI, ADUS31201-T” and the serial no. Strangely Citizen decided to mark them with the production date and so did they do it on older ones but not on their first divers. ūüė¶ I wish I could say for sure when the first real diver made by Citizen was manufactured. Under the case back we have the automatic (hand winding also possible) Citizen 19 jewels movement, cal 2400.¬†In the early till mid 1960’s Citizen used its own circular geared rotor (Jet rotor movements) in its automatic watches. ¬†In 1963 they began replacing the Jet rotor with the more common oscillating weight, which, some say it was cheaper to manufacture and more easily to service than the Jet rotor. The first model to use the swinging weight was known as the “Uniauto” (cal 1200) and came in several versions, all with a special logo on the dial and in 17 or 19 jeweled versions. This watch, presented here, has the logo on the inner bezel at 12. It works at 18,000bph. The date changes by advancing the hour hand past midnight. The seconds hand do not hack.

Still I have to find out why is it called “UNI”?

Read more about a different diver compressor style vintage Citizen here.

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Citizen Seven Star Para100mWater APSS2812-Y


The watch I introduce to you today is a variation of the Vintage Citizen compressor style diver 4-520343 Y, I wrote about HERE.

I called it a compressor style case because it is not a real compressor one but it only has the look of one. It has two crowns and an internal bidirectional rotating bezel that is operated by the crown at 2 o’clock. ¬†Because I have already reviewed the sister model in the article about 4-520343Y HERE, I will only post the pictures and point out the differences.

citizen seven star parawater compressor diver

So, this is the blue dial one, as clearly seen in the picture, and the dial in marked Seven Star. The case, movement, hands, crowns and straps are shared between the two models. The dial on this one is marked parawater and has the Seven Star logo “7” applied. The caseback is also different with different engraving.

For this particular watch I think the Tropic strap is a good match and really nice to wear.

Read about more diving watches here: https://vintagecitizenwatches.com/diving/

Citizen compressor diver – Seven Star 4-520017Y


Let me introduce to you a beautiful, NOS, vintage compressor style diver that has just the right amount of pure class.

A compressor case is defined by the fact that the rotating bezel is inside the case, under the crystal and it is turned by one of the crowns, rather than directly by hand. Gary, a reader, provided a piece of information about Compressor cases that I would love to share with you:

“These are beautful watches and I enjoyed reading about them but I must correct your assumption that they are compressor watches. Its a common misconception that if a watch has two crowns and an internal bezel, it must be a supercompressor but infact Compressor and Super Compressor watches are defines by the company which made the cases and held a patent for their design. These cases were made by the specialist manufacturer Ervin Piquerez S.A. of Switzerland. No Japanese manufacturer used EPSA Compressor cases. Information about Compressor cases is not hard to find. The link below shows the three types of Compressor case, including the Super Compressor from which your Citizen watches are inspired. True Super Compressors are typically identified by a crossed hatched design on the crowns, a diver helmet logo on the case back or inside the case back, but always, they have the brevet (patent) number on or inside the case back.¬†http://wornandwound.com/2014/03/24/guide-super-compressors/”

NOS means New Old Stock – a watch that was not worn and it is in excelent condition after all this time (45 years old).

citizen compressor diver seven star parawater

Just like the other compressor diver I have presented here : https://vintagecitizenwatches.com/2014/01/18/vintage-citizen-compressor-diver-4-520343-y/, this one is also made in 1969. By contrast, this one has a more classy, elegant appearance.

The case is large, made in polished stainless steel, with a brushed frontal surface. Looking at it from the side, the case seams slender, thick in the middle, and arching down all the way to the end of the integrated lugs. The mineral crystal is slightly domed in order to be better integrated in the overall design. The crystal is secured by a thin, polished, elegant bezel. The sides and the frontal surface are well delimitated by a carefully made polished chamfer. The twin crowns are not signed. One of then, the upper one, turns the bidirectional internal bezel and the other one is connected to the movement. The case-back displays the usual information Рmaterial, date of manufacture, model, movement, and parawater. Read about parawater here: https://vintagecitizenwatches.com/2013/12/26/citizen-parawater-citizen-parashock/

The dial is dark-deep black,  very simple but not simplistic at all. Under magnification one can see that a lot of attention was placed into details. The writing is white, also on the black date and the black day wheels. The date is on 3 o clock inside a polished frame and the day is at 9 inside an oval, carefully made window. The only tint of color is the lettering for Sunday.  The inner rotating bezel is also black with white writing. The hour markers are applied with luminous material in the center. The hands are also polished, faceted with luminous material as well.

 Citizen diver Seven Star 4-520017Y

The movement is the usual¬†automatic Citizen calibre 5270, with 21 jewels. The calibre number is engraved, as usual, under the balance wheel. ¬†It is winded by a black rotor that compliments the dial on the other side in a fortunate manner. ¬†It is a common movement used in a variety of models, not only divers making it rather easy to repair with available parts. It is reliable and offers hand winding possibility. The date changes in the second position of the winding crown (first position for winding, third for time setting) but the day changes only by passing midnight with the hands. The corespondent crown for the movement is the one at 4 o ‘clock.

The bracelet is nothing less than a piece of art. I think this is my favorite Citizen design. It is made in solid steel, three thin polished connectors and ¬†brushed large links. It doesn’t get better than this! It has a pleasant tactile feel and a nice weight. One more thing that can not be described into words is the sound of the links touching each other… pure music. The clasp is the usual type, signed Citizen.

Citizen compressor diver - Seven Star 4-520017Y

Al things considered, this is the best diver for a gentleman, ready to be worn at the beach or with a suit during a corporate meeting. Decent water resistance (nor really made for submerging, but good enough for daily jobs) and understated elegance placed together for one of the best Vintage Citizen All-rounder.

Read more about Citizen diving watches here: https://vintagecitizenwatches.com/diver-vcw/