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the LARGE M5 lettering and case numbers on the back and slightly larger case than a G denotes it a 316  swiss case  

USA cases have much smaller letters and numbers on the case back plus they are slightly smaller diameter at just under 1 mm smaller and I have several factory G cases to compare it to so this is a 316-1 case, - 1 denoting stainless steel  

you are entitled to your opinion but you are incorrect  

thanks for your input