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ETA 251.272KhakiAviationQuartzChrono
22jewels
ETA 24-2JazzmasterSquareAutoChrono
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ETA 7753 JazzmasterAutoChrono
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ETA 7750KhakiFieldAutoChrono
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ETA 251.471KhakiAirQuartzChrono
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Congratulations
Hamilton is delighted that you have chosen a time-piece from its collection. You have acquired a small technological marvel that will serve you faithfully for many years. The most advanced technologies were used throughout its manufacture and it un-derwent stringent controls before it was released for sale.
Characteristics
A Start/Stopbutton
B Buttonforresettingtozero
C Crownforadjustments
D Buttonforsettingdate
E Crownforadjustmentofinteriorrotatingbezel
y 60-secondcounter
x 30-minutecounter
c 12-hourcounter
1/10secondcounter
Smallsecondsdisplay
Date/Day
Telemeterortachometerscale
Interiorrotatingbezel
Care and maintenance
RecommendationsLikeallmicro-mechanicalprecisioninstruments,yourHamiltonwatchshouldbecheckedatleastonceeverytwoyears.EntrustyourwatchonlytoanauthorizedHamiltonagent.Tokeepyourwatchwater-resistant,makesurethatitssealingfeaturesaretestedateverycheck-up.Thewater-resistanceofyourwatchisindicatedonthecaseback.
Ex: 3ATM=30meters=100feet/5ATM=50meters=165feet/10ATM=100meters=330feet/20ATM=200meters=660feet(page78)
Five basic rules for maintaining the water-resistance of your watch 1. Haveyourwatchcheckedregularly.
2. Donotmovethecrownwhenyouareinwater.
3. Rinseoffyourwatchwithfreshwaterafteranyimmersioninseawater.
4. Dryyourwatchwheneveritgetswet.
5. Haveyourwatchcheckedforwater-resistancebyanauthorizedHamiltonagenteachtimethecaseisopened.
Automatic movement. The mechanism ofthe watch includes an oscillating rotor thatwindsthemainspringviathemotionofyourwrist.Thepowerreserve isapproximately42hours.Ifnecessary,thewatchmayberewoundmanually.Withmostofourmodels,thebeautyoftheinnerworkingofthewatchmovementcanbeadmiredthroughthetransparentcaseback.
Quartz movement.Theelectricalenergypro-videdbythebatterycausesthequartzintheinterior of the watch movement to oscillate32,768timespersecond.Thishighfrequencygives great accuracy.The seconds hand ad-vancesinsteps.
Adjustments
NB: Oncertainmodels thecrown is screweddownto guarantee optimal water-resistance. It must beunscrewedtomakeadjustments.Afteradjustmentsmakesureitisscreweddownagain.Pleasenotethatwater-resistanceisonlyguaranteedwhenthecrownisscreweddown.
Setting the time1. PulloutthecrownCcompletelytoposition(p2):
thesecondshandstops*.
2. Setthetimebyturningthecrowninthedesireddirection.
3. Pushthecrownbackincompletely:thesecondshandstartsagain,allowingperfectsynchronizationwithatimesignal.
*stopsecondsaccordingtomodel
Setting the date and the day 1. PulloutthecrownCtoposition(p1).
2. Turnthecrowncounterclockwiseuntilthedesireddateisdisplayedandclockwisetodisplaythedesiredday.
3. Pushthecrownbackincompletely.
NB: Avoidperformingthisoperationbetween8p.m.and2a.m.
Movement ETA 77531. PressbuttonDusinge.g.thetipofaballpoint
pen.
2. Thedatechangesateachpress.
NB: Adjustmentisnotpossiblebetween8.30p.m.and11.p.m.
Setting the time zone and the date
1. PulloutthecrowntoCtoposition(p1).
2. Turnthecrowntoadvancethehourhand.Thedatechangeseachtimethehandpasses12o’clockmidnight.
3. Pushthecrownbackincompletely.
Important: Donot leavethecrown inposition(p1)forlongerthan20minutes,asthismightinterferewiththetimefunction.
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Using the chronograph
Start-Stop functionTimingasingleevent:1. PressbuttonA:thechronographstarts.
2. PressbuttonA:thechronographstops.
3. PressbuttonBtoresettozero.
NB: Beforeyoustarttiming,thehandsshouldberesettozero.Ifnecessary,pressbuttonB.
Cumulative time functionThismeasuressuccessivetimes.Eachresultisaddedtothepreviousone.1. PressbuttonA:thechronographstarts.
2. PressbuttonAagain:thechronographstops.Repeatthesetwostepsasmanytimesasdesired.Attheendofthelastmeasurement,thechronographdisplaysthetotalofallthetimesmeasured.PressbuttonBtoresettozero.
Technical information
TelemeterScaleshowingthedistancetraveledbyasoundinacertaintime.Forexample,tomeasurethedistanceseparatingyoufromastorm,startthechronographwhenyouseelightningandstopitwhenyouheartheresultingthunder.Ameasurementof3secondsgivesadistanceof1kmonthetelemeterscale.
TachometerScaleshowingtheaveragespeedofavehicle.Usingthechronograph(Start/Stop)function,measurethetimetakentotravel1km.Theaveragespeedcanbereadonthetachometerscale.
Ex: 20seconds=180km/h
E.O.L. function (indicationoftheendofbatterylife)Ifthesecondshandstartstomovein4-secondsteps,thebatteryshouldbechangedbyyourHamiltonagent.
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Buckle adjustment
cxy
20 ATM
5 ATM
1 ATM 3 ATM
10 ATM
Water resistance example guide