It's unknown how many were produced. Zeno said there were originally 300 cases then he said there were 500. Not only did he supply me with the PRS-6 but he sold some to other German dealers (don't know how many) and he also changed the dial and sold it as a Zeno. I'm pretty sure that as a "Broadarrow", I've sold less than 100.
I now have only one remaining.
Eddie