Reduced Speedy Case Back Question

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Hi Omega Enthusiasts

I’ve come across a 3510.50 with serial number
50761***

The case back is suspect as it’s missing the hippocampus. This is a reputable second hand dealer so I’m wondering if it’s just a after market case?
 
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What does it say inside of the caseback?
That looks very off. Correct one for reference. Even if the markings were correct inside the caseback I'd avoid it...
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