I saw this picture in the brochure for excursions of the SBB. It's an advert for Luzern and the Lake of 4 Cantons.

Does anyone by chance know where it is specifically?

I do not know which one this is, but I know where you can find other waterfalls.

Edited to add:
Sherlock Holmes says it is not the Reichenbach Falls, but there is a web address on your scanned page . Check-it out. It could be the Stäubifall Äsch, Unterschächen.

Or you can try the link on the flyer - www.luzern.com/water

Ooh, I didn't even read that there was a weblink on the advert.... Bit slow this morning
It does indeed look like Stäubifall Äsch! Thanks!!