Another vintage diver is the model 51-2273.
This one is more recent than the previously featured watches here.
One of the main feature about this one, compared with the others, is the unidirectional rotating bezel. Also, the “Mercedes” hands are gone and are replaced with a different style.
The case is made in stainless steel, with a brushed (circular) front surface and polished sides. The case back screws in and it is polished too. This case features crown guards for protecting the crown, a nice diving detail that enhances the “tool watch” appearance. Another diving feature in the screw in crown and the unidirectional bezel. This time the bezel has 60 solid clicks and rotates only counter clock wise. On 12 it has a triangle with a luminous dot. Every 10 minutes are marked with numbers and every minute by lines. The overall size is perfect, at 40 mm diameters without the crown and 20 mm between lugs. The mineral crystal is flat.
The dial is mate black without any reflections. The hour markers are dots or lines, depending on the position. They are filed with luminous material. The hands are also luminous and they have a distinct shape, more geometrical, that I think enhance the overall look of the watch. On 12 there is the applied Citizen logo and “automatic”; on 6 there is the writing: “21 jewels – water resistant – 150 M ” On 3 there is the day-date window, in a single frame. The day is bilingual with red “Sunday” while rest are black.
The movement is the well known automatic Citizen calibre 8200A (Miyota). It has 21 jewels and offers a hand winding capability. First position of the crown wind the watch, the second will change the day and the date (in different directions) and the third will set the time. It beats at 21,600 bph and has a power reserve of 43 hours. The rotor will wind the watch in one direction only. Nothing fancy about this, just a reliable, simple movement that is doing it’s job as it should.
The strap on this watch is a rubber one with a stainless steel clasp. Rubber fits it very well and next to the nato straps it is the best option for this model. The width at the lugs is 20mm so plenty of strap options are available at this size.
Conclusion: A nice diver that has all the features of a real diver: unidirectional 60 clicks bezel, easy to read, mate dial with clear hour markers and hands, a sweeping central second hand, screw in crown protected by crown guards, a reliable simple automatic movement and a long rubber strap. A real tool watch!