It is the button on the end of the spindle that is used for adjusting the time and/or date on an analogue (non digital) watch. In older watches and pocket watches which are not powered by batteries it is also used to wind the watch spring to give it power. Generally the winding is done with the crown flush against the watch, pulled out once it adjusts the date (if it has one) and pulled out a second "click" it adjusts the time. The crown is generally round and ridged to provide grip on the finger.
To change the watch crown, the back of the watch must be taken off. The inner workings of the watch are then removed, and the old crown taken out. The process is reversed to put the watch back together. Some of the fancier watches have a crown that can be unscrewed from the outside.
crown: Also called a stem or pin, a crown is the knob/button on the outside of the watch case that is used to set the time and date. In a mechanical watch the crown also winds the mainspring. In this case it is also called a "winding stem". A screw in (or screw down) crown is used to make a watch more water resistant. The crown actually screws into the case, dramatically increasing the water-tightness of the watch.
Rolex
I own an AT0875-09E, and can report that the crown does not screw down, although the watch is WR200. I have swum with it with no problems.
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The pocket watch will have a 'crown' that will , usually , have two positions in which to set both the date and time . Gently pull the 'crown' up into one of the two positions and turn the crown to see which function is being affected - either the date or time . Set the watch and return the 'crown' to it's original position .
To wind a Baume et Mercier automatic watch, hold the watch in one hand and unscrew the crown located on the side of the watch. Gently pull the crown out to the first position and turn it clockwise for about 30-40 turns. Push the crown back in and screw it back tightly. Your watch should now be wound and ready to wear.
The part of a watch you pull out to change the time is called the crown..
It's a battery- saver that assures the watch is not running until the end- customer gets it.
Pull the crown of the watch upward and then turn right or left to get the desired time.
To set a Philip Persio watch, first pull out the crown (the small knob on the side of the watch). Turn the crown clockwise or counterclockwise to set the time and date. Push the crown back in once you have set the time and date to the desired positions.
You can wind the watch manually. Manual winding will require the crown of the watch to be pulled or unscrewed to set the time and all the other functions. This will reduce the life of the winding gears and destroy the threads on the tube of the crown. In addition, to reducing wear and tear of the crown system , a properly designed watch winder can help distribute the lubricating oil inside the watch evenly, in most cases. When you don't wear your automatic watch, it's best to keep it in watch winder. I bought one and it works perfect, even smells great and keeps my watch running perfect when not in use.