I slightly reworded only what applies to this owl's back stamp. You can search for the article and read it. Mid-1980s Nao Factory Back-stamp Mark.
"Although very similar to the "official" 1996 Nao back-stamp, (which is black and missing the word'Daisa"), this mark appears the same (only in a light brown color) and includes the word'Dasia'. It is thought that this design was in use from the mid to late 1980s, all the way up to when it was designated as official in 1996. There is at least one year in that time frame that the date was added as shown in the article, it was 1988.