Dear Sirs I am writing to you because I am looking for a part for my wrist watch. The watch is SECTOR model 2653450035 702. The part CROWN in this watch is missing. I have contacted several watch companies in my country, but nobody can help me. Could you please tell me where the part can be purchased How much does it cost? I look forward to hearing form you, Maciej Jaskowiak

this can be done at ebay sir.

you need not pay anything extra.
but it will consume some time for you for getting it done in a effective manner.

Unscrew crown. Some models of Sector Sport watches may have a screw down crown. Watches meant to be used in water will often have this feature. To test this try spinning the crown freely in both directions. If it does not spin freely it has a screw down crown. If your Sector has a screw-down crown, turn it in a counter clockwise motion to unscrew it until it pops free.

Pull crown out one click and set date. If the watch has a date perform this step, if not move on to the next step. Pull the crown out one click. Twist crown clockwise and counter clockwise to set the day and date to the previous days day and date. The purpose of this is to set the date by setting the time and insuring the watch is in the correct a.m. and p.m. mode.

Pull crown out to the next click and set time. Pull the crown out the to next click. This is the time setting mode. Set the time by turning the crown clockwise until the day or date changes to the current date. This is the a.m. mode. Continue to the correct time. If it is a p.m. time this will require moving one full circuit of the dial past the twelve again and then to the correct time. If you fail to do this, the date will change at noon. If there is no date, simply set it to the correct time.

Push in and screw down crown to retain water resistance. Push crown down into its furthest setting. If it is a screw-down crown, press the crown in with a finger and twist it clockwise. Be careful here not to cross thread the crown in the crown tube or it will need to be replaced. It should be smooth and easy to turn. If any pressure or resistance is felt stop and start over. If you fail to screw in a screw down crown your Sector Sport watch will not be water resistant.

Go to http://www.sectornolimits.eu/#/sector/eng/contact/user-manual (click on this link) and you will see a list of manuals, choose the one for your watch and download it.

Could not find a download for instructions on this watch, but I did manage to find some basic instructions for the Sector brand. I hope this helps as this is the best I can come up with.
Good luck.
Sector Chronograph Watch Instructions

Most chronograph watches have screw-down crowns for water resistance. You must unscrew the watch crown before you can make any changes to the watch time. After time is set screw the crown back in. To utilize the chronograph dials, use the buttons on the side of the watch. One button will be for the second timer. Press once for the second hand to start timing. Press again to stop it. Another button will be to reset the second hand timer back to zero. Sector Chronograph watches may have different dial functions (see link in References).

Sector Dual-Time Watch Instructions

Because Sector watches are known for their sports capabilities, the Dual-Time watches have screw-down crowns. For Dual-Time timepieces, unscrew the crown counterclockwise. Pull the crown to middle position to set the date. Pull the crown out to its fully extended position and rotate it to set the day of the week, hour and time. Press and hold in the crown and turn clockwise to seal the crown back in to the watch.

Sector Ana-Digi Watch Instructions

Sector Ana-Digi timepieces have analog hands plus digital timekeeping functionality. To set the time, unscrew the crown counterclockwise and then clockwise to the appropriate time. The digital functionalities are programmed by the buttons on the side of the case. Depending on the style of the Sector watch, you can set the digital time with one button, set the date display, 1/100 seconds chronograph timer, altimeter, thermometer and alarm functions.

mcdevito75 Here, That muct be part of the Mechanism itself behind the crown, Best Bet, look for a small watch repair shop in your area to fix the watch, as the watch could be ruined by trying to get a stuck crown and stem back in. Or you can visit the repair service directory here at fixya, bottom of the page click on repair serice directory then watches.

The model 3001 does not have a screw down crown, but is just as water resistant as a screw down style

Try this: pull out the winding crown to the first click and change the date. Memorize which way the crown turns to do that. Now turn the crown in opposite direction and the day should adjust.
This solution wrks for most of the makes.
If this doesb't work - submit the make, model and all the writings on watch caseback.

Probably your watch has a screwdown crown and prior to attempt any settings you have to unscrew it. Some peoples fingers are stronger then others, so, try that with a pair of plyers. Cover your crown with a soft cloth and then grip with plyers(this will avoid any damage). Thread is right handed and unscrewing is done by turning the crown anticlockwise.
After setting the time don't forget to screw the crown back- it is for water resistance.
If you are unable to unscrew the crown, that means your watch is rusty and you will need watchmakers help.
PS If the watch is rusty, you can brake the crown off while trying to unscrew it. Don't panic yet, as in this case you will need a watchmaker anyway.
Don't forget to rate, please.

I don't know where you can get an instruction manual but have you tried pulling out the crown where you set the watch half a click. After you do that turn the crown away from you to set the day and towards you to set the month.