Vintage aviator Citizen 51-1811


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.

Citizen aviator 51-1811

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.

Pilot aviator Citizen

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.

RAF aviation watch RAF Citizen

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.

Advertisements

3 thoughts on “Vintage aviator Citizen 51-1811

  1. Pingback: Is This a Real Vintage Citizen?

  2. 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

    Like

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s