Don't just get the mall guy to put a new one on. You need to have it checked by a watchmaker. My daughter dropped her Wewood watch and the mineral crystal shattered and the watch stopped, so she put it in a drawer a few years ago. I gathered her dead watches when I visited recently and found that the battery had died / leaked and the movement was stuffed, so a new movement (AUD$7.00) but I had to use the original (Date @ 6) date wheel. When I removed it I was surprised at the amount of glass that had managed to get under the dial. So, the moral of this story...............
Indeed... A broken crystal, other than acrylic, requires the movement to be serviced typically - replaced if it's quartz and cheap... Cheers, Al
My ExpII required new dial, hands and service when I dropped it during a vacation in Sydney AU, repairs cost more than my round trip flight...