The first two digits of the number stamped in the heel represent the year of the Emperor of Japan up until the year 2000. In this sense 05 could be the 5th year of Heisa which would equal 1993. As they changed the numbering in 2001 to the last two digits of the year, 05 appears again in 2005, which is not reasonable for your guitar.
I’m not totally sure but believe the next two digits represent the month of production which would mean that your guitar was produced in December 1993!?
For example beanctr‘s CY116 should have a serial number starting with 61 stamped in the heel!
The serial number printed on the label is usually of no use for dating of the guitar, as it is related to the production site.