Welcome to the Forum, 1911texan!
And EAA was not in business til around 2005,
EAA was formed around 1988 or so, from the remnants of FIE Corp and EXCAM, both which imported Tanfoglio and other Firearms.
And are you sure it's stainless, eaa makes a wonderfinish that is a hard chrome that a lot of people confuse with stainless? Im not up to speed on the witness elites so it could be stainless, but Tanfoglio is not known for making stainless guns.
There were some very rare Stainless Steel Witnesses in 9mm and .45 ACP made in the early 1990's prior to the introduction of the Wonder Finish, the latter which is a Silver Grey Tenifer Finish. Prior to that, the alternative finish to Blue was an Industrial Hard Chrome, which can often be mistaken for Stainless Steel.
To find out exactly when your Pistol was imported, go to the Tanfoglio Website and email Tanfoglio directly with the Serial Number.
http://www.tanfoglio.it/eng/home.php