I've seen at least one at a Pinkstertreffen, but that of course might have been a retrofit (or the prototype )The only 750 model to get it was the GTL, I suspect the 200mm headlamp was only to be found in GTL sales/press brochures.
My GTL is shown in "La Diva", page 55, with 180mm headlight. As it was one of the bikes used for brochures, etc, it's quite safe to assume it was one of the earliest, maybe even THE prototype. #17936, with production GTLs stated as being "in the 18000 range". Other GTLs shown also carry the 180mm unit.I've seen at least one at a Pinkstertreffen, but that of course might have been a retrofit (or the prototype )