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@Rik_Van_Looy
That sticker was certainly applied to GP4's (along with GEL330's and MA40's and possibly Open 4CD's) - Velobase is pretty good for this sort of thing.
Here's their entry on GP 4
http://velobase.com/ViewComponent.aspx?ID=17da05a0-23e7-45a0-a978-bd052fd9abb2