I don't have one of these and I have never seen one. However from the little documentation I have seen it looks like the US320f is the same as the NEC US3210e but runs Windows 10 IoT as its embedded OS. As always with the next generation of a Microsoft OS they have felt the need to increase the amount of flash and RAM fitted.
The photo of the US320f and the hardware specification in the US320f operating manual matches those of the US320e except that it is fitted with 32GB of flash and 4GB of RAM.
Any comments? email me. Added August 2022