Industrial Sewing Machines Juki

What year was the Juki DDL-227 industrial sewing machine first made?
Recently aquired my grandmothers old sewing machine and i’m just curious to know when the DDL-227 was first manufactured? Tried to google, all that turned up were sellers… does anyone know? I know my grandparents got it in the mid-eighties, but it must have been around before then…
thanks!
http://www.juki.co.jp/company_e/nenpu.html The JUKI Co. was established in 1938
I couldn’t find anything with the code you were asking about so use this “contact us”
http://www.juki.co.jp/contact_e/contact.html