The style is very similar to the PANArt logo featured on the sticker found inside each first generation Hang...
Later first generation Hang feature a different style of brand (I'm gonna' guess that it came into use somewhere in the early thousands, but could easily be wrong), that PANArt seemed to settle on for generations to come. The same style of logo also features on later generation Hang, and can also be seen on PANArt's more recent creation, the Gubal.
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The text no longer slants as it did in earlier first generation Hang. And it tends to look a little more machine applied, than hand applied (but maybe Felix and Sabina just got better at doing it).
One anomaly, that I've stumbled across recently, can (just about - I'll try to get a better photo soon) be seen in the following photo...
Which features a small "a", in the brand. And featured on Hang number 933. So this particular style may have been an experimental brand that was toyed with, before the more standardised form featured previously was settled upon.
* As a point of note, first generation Hang were offered by PANArt between 2001 and 2005. And approximately 4300 first generation Hang were produced. You can watch them being made by PANArt in the documentary titled, "Hang: A Discreet Revolution": HERE
