pulguitel

Many thanks! as a newbie this info is very useful!

Dear all, First of all, I have to introduce myself. I am a watch lover that writes from Spain, I like reps and gens and I have been reading you for several months. Thanks to all of you for helping us to learn!! and now.... I've had a problem with my mothers Datejust mid size (31 mm). I purchased it some months ago as a gift for my mom (the exact model is: perfect-hour.com/rdjmt30041-ssyg-oyster-sunray-white-numeral-swiss-28362-p-7815.htm) and the result is very good, the quality of the watch is amazing. But 2 days ago, it fell to the floor and here it is the result: How can I know which crystal to buy? I've been googling for it with the case number or model number (178278) that can be seen in the pictures, with the model name, etc. In Ofrei there is a huge list of crystals but I don't know which one is the one to chose. Is it completly necessary to disassemble the watch to measure the diameter and thickness of the crystal and then go to cousins.uk for example? Is there any rolex expert that could tell me the measures??? or the model of the crystal? Thanks in advance for your help and best regards