Clear Seamaster Deville caseback?

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Has anyone seen or heard of a clear plastic caseback like the one shown in the picture below?
My daughter's fiancé is considering it but I don't know if it's practical to wear or if it could be a "salesman sample" as advertized?
 
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The movement is wrong, should be cal. 560.
I noticed that. I'm advising against the purchase at the price asked.