Wow, thanks for posting the detailed pics. It looks like an older Mastech [ or Mastech copied them, who knows?] or maybe they all get their 'generic' boxes from the same maker and design the electronics around it. Mastech lists the 1803 for $64 athough its +1A more than CS, the CS model appears decent, if it checks out spec wise.

Not mentioned in the manuals is that LED annunciator pictured above near the V adjust, its likely in constant voltage mode when it lights, is there another for constant current?
The newer Mastech's have a different look and adjusts, more akin to the GWInstek PSU:

I haven't had time to take photos, but compared to your CS PSU, the Mastech uses through hole components, no SMD, and very much like the photos I posted on this link:
https://www.eevblog.com/forum/index.php?topic=686.msg9661#msg9661The links you provided include the schematics, what couldn't be better? Its pretty straightforward too, the LCD readouts are built around the 7106 Intersil DVM, its dual, one for V and A.
The PCB has QJE on them, and I can track it to a Chinese model PSU with model numbers QJXXYY for XX = volts, YY = Amps.
In China, the model referencing QJE directly are these, but from year 2008 :
http://www.gkzhan.com/st15602/product_304055.htmlhttp://www.rclmeter.com/s02/product/2008/12/03/6443158.htmland you can see it has the same LCD board as the CS.
QJE direct Chinese links suggeset the parent model is made in the province Guangdong, where a QJE factory exists, but while they say they 'contract' manufacture their parent products are electrical equipment.
http://www.chinaqje.com/Company/The PCB has clear hand soldering and corrections [see the link for the factory pics, lots of hand labor].
In the end, one thing we'd all like to know is how does it perform to spec? Check the short circuit protection, you can also use that setting to check the constant current adjust. Check the load regulation, just attached it to a load and put a scope across the power input and look for ripple.
Once you've spec'd it out, that would be the 'real' specs I'd rely on rather than the rather spartan manual on the website.
Congratulations and enjoy!