If that is a real Cartier watch and you have lost the crown which is the piece that you use to either wind or set the time then you will need to send it back to Cartier. They dont sell parts to watch repair shops! :-)
If it's a replica then you can take it to a reputable watch repair shop and they can install a generic crown!
http://www.cartier.us/#/contact-us/call-an-advisor
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