I've seen several demo movements, usually contained between two lenticular pieces of glass held together with a metal rim. One I had is a late 1950s early 1960s Girard Perregaux Gyromatic as pictured, although the pics are from an ebay auction (mine is identical).
I was wondering how common this sort of sales demo was and what other makes people have seen.
I also have one of the GP movements made (and filled with( for Shell Oil.
I was wondering how common this sort of sales demo was and what other makes people have seen.


I also have one of the GP movements made (and filled with( for Shell Oil.
