My PenBBS 322 just arrived. This is their new, smaller pen.
As you can see from the pictures, it's not that much shorter than the 308 or 309, but it's much slimmer and with a smaller nib (it looks like a #5). It also comes in simpler packaging. The acrylic is nice and clear, and feels fine. Unlike the 308 and 309 (or pens like the the Procolor) there is no cap band which means the threads are visible in this model.
In size and feel it is very close to the Pilot 78g and I imagine that it's attempting to offer a similar entry point. This cost me just over £11 including shipping - around $14.50.
The star of the show for me is the nib. It's really excellent - a firm EF with some feedback. It feels a bit smoother than the EF #6 nib that they use on the bigger models. As you can see it has a heart shaped breather hole.
You could probably eye-dropper this pen, but unlike the other models, it doesn’t come with a rubber o-ring. So you'd have to exercise some caution.
At the moment this is only available on the Etsy store, and as a demonstrator. I imagine that this is to test the market a bit. I think this is an interesting new departure for PenBBS. All of their other pens have been based around the #6 nibs, so it will be interesting to see if theyr produce more models using this smaller nib.
Personally I find the size a little too small for me. So I'm not sure I'll be buying any more of these, although I'm looking forward to see if they produce them in any of their wonderful acrylics. If PenBBS produce a 322 in the Autumn Gradient I will be the first in the queue!
(Sorry - the pics aren't great: I took them on my phone. But I hope they give the idea.)