How to date a Citizen watch

On the back case of a vintage Citizen watch from the 70s there are typically several rows with numbers.

Blogger Sweephand is one of the leading experts on vintage Citizen's. Illustration from Sweephand:

Quote from Sweephand with my comments in brackets:

The key is knowing which decade the watch was produced in, and the Movement Table is useful for determining that. (The watch above is from the 70s).

The first three numbers in the serial are used for the date – the first number is the year. (Thus the watch above is from "3" = 1973 and "11" = november).

One more example:

This watch is a 51-1811 and has a caliber 8200A movement produced from 1975. The serial is "0" = 1980 and "03" = march.

And one more 51-1811:

This watch is from "8" = 1978 and "08" = august.

The Coriental watch brand

Not much is known. The brand Coriental is not even listed in Mikrolisk.

I have only found a few Coriental watches on the net:

If you take away the first "C" and last "AL" it spells "ORIENT"...

It seems to be a common assumption that brand names like CORIENTAL, ASEIKON, BASEIKONE, LESEIKORI and ACITIZENO for some reason where invented to take advantage of the rising popularity of japanese watch brands in the 70s. 

Some speculate that the buyers could wipe out the first and last letters and then pretend to have a genuine ORIENT or SEIKO. And then my Coriental would end up looking something like this:

It's not centered on the watch and it would still have the characteristic logo stripe. It doesn't make sense. Maybe Coriental did start out as a homage/cheat brand but eventually grew into a brand in its own right?