I did say, "Helvetica-related" didn't I. This is perhaps the smallest stamp collection ever. It's very focused, the criteria being: a) Swiss, and b) Nice.
Wikipedia explains the use of that word, "Helvetia is the Roman name for an ancient region of central Europe occupying a plateau between the Alps and the Jura Mountains. Helvetia corresponded roughly to the western part of modern Switzerland, and the name is still used poetically." The font's name is, of course, a derivative.
Ironically, very few of these actually feature Helvetica. But then, why should they?
I have posted a few of these before, individually, but I thought they might warrant a collective post of their own. My entire collection fits neatly into a Moleskin Pocket Book. There's a few more on Flickr.