Model = BY0000-56L ;  Movement = H610-S060257_HST ;  ID = 0D1021751

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DISCUSSION:  BREITLING's »NAVITIMER« vs. CITIZEN's Model BY0000-56L
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I'm aware about the difficulty of this task because of  BREITLING's
shining immage (see WWW.BREITLING.COM) as an object of desire ... 

... But let's be rational ...

Both "NAVITIMER" are wonderful pieces of art in fine mechanics. The
"Old-Timer" BREITLING  is genuine mechanical and selfwinding by the
movement of its wearer's forearm.  As a CHRONOMETER with STOP WATCH
& DATE DISPLAY it has its own fan club because of its high quality.
The "Newcomer" CITIZEN include modern technology with more features
to a reasonable price ( ~ 1/10 of BREITLING's MSRP ) -  T H I N K !

CITIZEN has a line of "Aviation Watches"  called  » SKYHAWK «  with
a mixed analog & digital (LCD) surface.  I prefer the "Pure Analog"
Model »BY0000-56L« of the » PERPETUAL CALENDAR « - Line  because it
seems to be the  "Best-Of-Both-Worlds"  combining mechanical beauty
of a SlideRule/Aviation Watch with Radio-/Quartz-/Solar-Technology:

CITIZEN's Model  »BY0000-56L«  has a mechanical surface - but it is
motorized, MICRO-PROCESSOR controlled  and charged by  SOLAR POWER.
( The »ECO-DRIVE TECHNOLOGY« doesn't need an exchangable battery !)
It is a  RADIO Controlled QUARTZ-Chronometer also with STOP WATCH &
DATE DISPLAY. DATE CHANGE is automated, considering  LEAP YEARS.  A
24h-SCALE, a 24h-ALARM, as well as (easy to switch) ALL  TIME ZONES
are useful additional features - also working w/o Radio Connection!

BREITLING's  » NAVITIMER «  Surface:
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Outer Circ.Scales = SlideRule 32 mm Diameter
                    (C) = turnable by the Top Ring
                    (D) = fix;
               Markers: NAUT, STAT
                    Tachymeter
         Calendar = Manual Settings
        Sub Dials = Seconds;
                    Stop-Minutes;
                    Stop-Hours (max. 12 Hours)
        StopWatch = max. 12 Hours
            Crown = Set Time / Set Date
       Upper Knob = StopWatch = Start / Stop / Start / ...
       Lower Knob = StopWatch = Reset
            Hands = Hours & Minutes ( = luminous );
                    StopWatch = 0.2 Second Increments
         Accuracy = +/- 5 Seconds per Day
    Power Reserve = 2 Days
 Water Resistance = 3 bar

           ... for more  DETAILS  refer to  WWW.BREITLING.COM

CITIZEN's  Model  » BY0000-56L «  Surface:
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Outer Circ.Scales = SlideRule 34 mm Diameter
                    (C) =  easy turnable by the left "8"-Knob;
               Markers: LITERS, FUEL LBS, OIL LBS, IMP GAL, US GAL
                    (D) =  fix;
               Markers: NAUT, STAT, KM
                (h/min) =  Conversion  ( e.g.  4:30 = 270 min )
         Calendar = Automatic Settings ( incl. LeapYears )
        WorldTime = (eg.) LAX = LosAngeles = Pacific Time
                          PAR = Paris = Middle-European Time
                             ...
        Sub Dials = StopWatch Minutes
                      (+ Power Reserve Check)
                    24h Watch;
                      ( ??? 24/12 Design ??? )
                    Seconds;
                      (+ RadioStation Indication:
                           EUR = DCF77;
                           USA = WWVB;
                           JPN = JJY;
                           CHN = BPC
                      )
            Crown (w.Buttons A & B)
                  = Set (World) Time / Set Date;
                    Set (24h) Alarm
            Hands = Hours & Minutes ( = luminous );
                    StopWatch = 0.2 Second Increments
         Accuracy = +/- 15 Seconds per Month (w/o RadioSignal)
        StopWatch = max. 1 Hour
    Upper Knob(B) = StopWatch = Start/Stop/Start/ ...
    Lower Knob(A) = StopWatch = Reset
                      (+ Check Power Reserve)
                      (+ Radio Reception on demand)
    Power Reserve = 8 Month after full charge
 Water Resistance = 20 bar
          Markers : DayLight SavingTime Indication;
                    Signal Reception Indication;
                    Alarm Indication
                    
           ... for more  DETAILS  refer to  WWW.CITIZENWATCH.COM

( As joked in  BREITLING )   Valide for both ...
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In addition to using the  SLIDE RULE for multiplication & division,
it is a "NAVIGATION COMPUTER".  Pilots may perform all calculations
a flight plan requires:  Ground speed,  miles per minute,  gasoline
consumption,  rate or distance  of climb or decent  and  conversion
of nautical and statute miles.                                     

BUT:  In most cases the Co-Pilot has to hold the Magnifying Glass &
      the FlashLight when the Pilot adjust the SlideRule ...     

My Suggestion:
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When you have a BREITLING NAVITIMER, enjoy it on special occasions.
For daily activities CITIZEN's Model » BY0000-56L « is very usefull
with MORE features ( AutoCalendar, 24h-Watch/-Alarm, all TimeZones;
Switching TimeZones also switches the  Date accordingly. Radio- and
Quartz-Accuracy - AND! - »ECO-DRIVE« / SolarPower needs NO BATTERY.
Available for a reasonable price,  IT IS AND HAS  the "Look-&-Feel"
of a mechanical marvel:  May be you don't need a BREITLING at all ?

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TALK & DEMO  CITIZEN's Model BY0000-56L vs. BREITLING's »NAVITIMER«
BERLIN-BRANDENBURGER SAMMLER-TREFFEN (8th-BBST-2011) ENERGIE-MUSEUM
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!!! BUT !!!  THERE ARE ALSO   C R I T I C I S M S  ...

                                 P.S.:   A CLOCK RODDLE
impressum:
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©  C.HAMANN       http://public.BHT-Berlin.de/hamann       11/11/11