A true “tool” watch for pilots, this is the automatic Citizen 51-1811.
The inner rotating bezel (slide rule) is very useful for all types of calculations. The interesting thing about this watch is that it was used for its original purpose, as an aviator watch.
The case is really large at about 42 mm without the crowns. It is made entirely in stainless steel. The front surface of the case is brushed with a circular grain, and the rest is polished. There is an interesting blue light reflecting all the time from the brushed finish, giving it a satinated feel. The winding crown is located at 3 and the one at 2 is for adjusting the inner bezel. The crowns are not signed. The ring bezel holding the large, flat (35mm) mineral crystal is polished too. As pictured, the case integrates the lugs and the twin crowns, protecting them.
The dial is the main attraction of the watch. It is grey, with a sunburst effect. On the outside there is a golden ring with black digits. The golden ring is circled by a thin red zone delimitating the dial from the golden rotating bezel. The entire face of the watch is shiny and powerful. On the grey zone there is the applied Citizen logo, the white painted lettering “automatic 21 jewels”, the day and the date (sharing a single golden frame) and the applied luminous hour markers. The hands are painted, partially, in black with a luminous line. The sweeping second hand is not painted.
The slide rule is the name of this type of internal bezel. How does it work? In a few words it is used for multiplication, division, distance and volume conversions, time calculations and percentages.
The movement is the well known 8200A Citizen calibre. It is an automatic movement (it can be also hand winded) beating at 21600 bph with a quickset day and date. It has a unidirectional winding rotor and 21 jewels. Nothing fancy, just an usual Citizen “workhorse”. It has a power reserve of about 44 hours.
The bracelet is a stainless steel one, with a polished center and brushed sides. It compliments the overall shinny design of the watch nicely. It has folded “H” shaped links and a signed “Citizen” clasp. As usual, very comfortable.
The PAF engraving (and the up pointing arrow) suggest it was in use by the air force and it seams that this was the Pakistan Air Force. So that makes it a tool watch, used for what it was meant to be used. Just a nice, interesting touch.
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What is the current price of used Citizen 51-1811 Diver and Aviator
Dial: Citizen Automatic 21 Jewels
Movement 8200A, introduced in 1975
Width: app. 42-43 mm
Length: app. 46 mm
Hello and welcome to the site! The price depends a lot on condition and how much the buyer is willing to pay.
Thank you for your reply, the watch is in pretty good condition. Do you know where I can find the approximate price for the watch? Compared to the PAF version, how is it?
You can post it on the Facebook group and others might give you an insight on the price. PAF or not, it should be about the same price. https://www.facebook.com/groups/vintagecitizenwatches/
Un Omega de piloto de la fuerza aérea del Perú costo 80.000 dólares
puede valer 10.000 dólares americanos
Anyone know where I can purchase replacement hour and seconds hand for this model ?
There is no place that sells them. If you are lucky… maybe you can find a donor watch. There are no parts available.