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Citizen sapphire crystal replacement


Bikerix

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I am trying to change my sons crystal on his citizen chronograph. I cannot find the thickness I require and just want to check with you all before I spend real money. I can find the width with no problem,  but depth is not the same in any way. I can only find the sapphire crystals will go to 2.4 thickness and the mineral in increments of 0.5 mm so 2.5mm and 3.00mm. The crystal installed is 2.84mm so my question is can I get away with a 2.4mm sapphire crystal and will it make a difference to the water resistance testing? I want it to be right and not just ok. He does tend to damage his watch crystals often so would like to fit something a bit more robust. I know that in the watch world  0.4mm can make a world of difference, but crystals I am having a bit of a mental wobble. 

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