How to get the case-back off on a Seiko 7T36-7A00?

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I assume it's a snap-back, but damned if I can find an indent for a case-knife. Can anyone assist?

 
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There might be a “lip” for a case knife hidden by a strap end, and wrist mung. Take the strap off and clean the perimeter of the case back with a tooth pick and you might find it.