Correct crystal for this 30T2

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Can anyone tell me the correct crystal for this? The one that’s in it now falls out as if it’s a hair too small.

 
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Get a pair of vernier callipers and measure the gap. Then buy one in that size and another a fraction bigger. I usually buy 2 or 3 of each size. Then I have spares, as they’re cheap but then you have the postage costs.
 
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Without knowing the case reference, all I can tell you is that the most common crystal diameters for vintage omegas are 29.6mm, 30.6mm and 31.6mm
 
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Without knowing the case reference, all I can tell you is that the most common crystal diameters for vintage omegas are 29.6mm, 30.6mm and 31.6mm
Inside of case back is just marked with 34.