Since you have stated ABSOLUTELY nothing about provinance... model, year... owners manual POLICE being a pretty decent watch from the UK (I'm going to skip right on past the AUTHENTIC notion... Chronograph (shown).
If your your watch is a REGULAR knock-off (replicant)... t has the miyota movement...
A highly precise and reliable motor in it's own right.
(sets very much like the high end valjoux cousins)
It is a crown-set... typically a three position stem set.
Force nothing... !!
Some GENTLY unscrew the crown... others will pull out
to set: 1, TIMW 2, DATE... THREE (back to normal -closed).
.
In the closed position
The stop/start butons do precisely that on those SUB-DIALS.
In the SET positions the start/reset buttons are used to ZERO those sub-dials (press & hold... then individual clicks will move each hand to zero).
Hope this helps!
http://www.bing.com/search?q=watch%20valjoux%20quartz%20movement&qs=n&form=QBRE&pq=watch%20valjoux&sc=0-13&sp=-1&sk=&cvid=607E5483C971481BBCFF824956E6A0D7police quartz movement Bing images
Hello Abhishek:
The following is a Google link that gives lots of contacts for repairing your watch.
https://www.google.ca/#q=police+watch+replacement+glass
I would also suggest that you may be able to go to any Jewellers in Dubai that sells watches and ask for a referal for a repair service.
Best of luck.
Cheers.
