Ok, so basically here is a Series 5mx I bought from eBay, I usually don't show this kind of stuff off on this site, but I figured I might as well for a change.
Background: Released in the year 1999 by Psion PLC, the Psion Series 5mx was an upgraded version of the Series 5 released in 1997, the Series 5mx featured 16MBs of battery backed RAM and a faster processor and a clearer screen compared to the Series 5. Like the Series 5, the Series 5mx featured a full QWERTY keyboard, a 5.6 inch monochrome resistive touch screen with a stylus, a Compact Flash card slot, RS232 Serial for file synchronization with a PC, IrDA for file transfers between a PC or another Psion and the EPOC32 Operating System (which would later spin off into Symbian OS, an OS seen on many Nokia devices later on.
I picked this Series 5mx up on eBay to replace the one I sold to someone to do a video on, it came with a sync cable, leather case and all the original box/documentation, all in really good condition. Compared to a modern smartphone, it's quite substantial, but compared to the relatively small at the time Gateway handbook series (I used the handbook 286 for comparison) as well an IBM Thinkpad T61 from 2007, it's pretty minuscule (though not as minuscule compared to even something like my Handspring Visor)