OEM case back gaskets: worth the additional expense?

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My watchmaker believes there’s no appreciable difference in the quality of OEM case back gaskets (like for a Speedmaster), vs whatever generic equivalent is available in the same specification. Agree or disagree?
 
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Is there a big difference in price?
 
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Is there a big difference in price?

Yeah, OEM $12/gasket. Seems expensive. Aftermarket a few dollars at most.
 
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Why gamble? It’s not the cost of the gasket it’s the potential cost of water intrusion.
 
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Yeah, OEM $12/gasket. Seems expensive. Aftermarket a few dollars at most.

Not that much from Omega...