Replica watch body of the double Casio F-100. Buy one to make a prop watch the same as Ripley wore in the Aliens movie! Why would you use a dummy blank 3d print instead of a pair of F-100s? Probably because you don't have hundreds of dollars for out-of-production collector watches lying around.
You can purchase the orange surround here: https://www.shapeways.com/product/YHX7SSUSW/ripley-watch-surround
Note that the print will not be smooth and shiny like the real watch. Apply a coat of gloss black paint for the finish you want.