Sold on eBay back in December 2013, was the PANArt Hang, number 65. Other than the Mother Hang, I think this is the earliest one I've ever seen (It's believed that PANArt made somewhere around 7000 Hanghang, before recently moving on to producing the Gubal).
Here are some pictures:
The Hang has the slightly rawer looking logo typical of early first generations, but more interestingly (to me) this early Hang is much bluer in colouration (especially on the inside) than the typical first gen. No video/audio though unfortunately, which would have been interesting to hear.
Here are a few photos of Hang no. 759 - still a relatively early Hang.
No blue colouration - but it still has that logo/branding that matches the font, and style found on the signed sticker placed inside each first generation Hang. To my eye, this also has a very distinctive look to the tone-fields, that seems common to early hang, when compared to later first generation Hang (and beyond).
For sale via HandPan Bay, at time of posting, is PANArt Hang number 123. Another example of a very early Hang, number 123 features the logo that is common to early made Hang, and as with Hang number 65 (above), looks like the shell from which it was made may have been spun(?) - it has the faint lines running all the way around the shell...
[NOTE] THIS LINK contains information that suggests that these very early Hang may not have been made from spun shells - despite having that look to them. But that instead the lines were caused by PANArt's polishing/finishing process.