Is this a legit 12C Platinum?

[AndiGer]

Found in a thread on HP website forum:

See here for the release date. For the serial number the typical format is to have the 4th, 5th, and 6th characters to reference when the product was built. The first character is the year date (Y) and the next two (WW), the week in that year it was made.

CCSYWWZZZZ

Assume it is 2016 in your case.

There was much stuff discussed on the used processors and their speed on this site.

See here there is also a link back to this website under referenced link no. 2

https://en.m.wikipedia.org/wiki/HP-12C

You can check the speed of the machine in your hands very easy:
Program:
+
GTO 01

Then in run mode fill the stack with all numbers 1.
Then run the program for 1 minute.
Old slow processor gives about 500 in the display, ARM processor (machine titled 12C+ here) over 70000 or even more.
Andi