Omega Seamaster 300 case back authentication

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Found some case back
I cant identify this so want some professional advice please
 
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Funny, you also see this "waterproop" error on fake Fortis supercompressor case-backs. Although usually someone completely obscures it using a polishing wheel.
 
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Waterrroop?

We have apparently gone from "certifed" to "waterroop" as the typo de jour...
 
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We have apparently gone from "certifed" to "waterroop" as the typo de jour...
That is a custom title for a while!