Product Numbering & Bar Code Verification of Phantom Plarail Sets

We are getting quite close.

MS-28 was actually before 1977 OR MS-28 did not represent the actual year of production.

How I get to this conclusion? The DD-51 that I bought is the answer. This DD-51 has the old power type (mid era) produced from 1968-1977, it is MS-28 and no barcode. How can this be? It looks like our conclusions are wrong about MS-nn representing a fiscal year?

Also this:



Our team member ID-2 said:

"JAN code standardisation has been carried out since 1978 and it is a very delicate time, so it is very helpful!"
"Red TOMY Logo is certainly from 1981 onwards, so you can guess that JAN management has been completed completely by JAN standardisation (1978) and the Red TOMY Logo period. JAN management seems to be stable around the time of "L Express Plaroad Set (1986 version)" In addition, since the ST mark full-scale operation is after 1972, it seems that you can know the age with this presence or absence"

Again if anyone has logos that you think can verify the years and help us with the research, please post them here.