Pre-seasoning of some cookware started in 2002 - this is according to Lodge in their catalog #10. Does anyone have a 2002 catalog? We do not have a PDF of one posted.
Catalog #9 which came out in 2005 has original finish (non-seasoned) cookware offered.
Catalog #10 which came out in January 2006 only lists seasoned cookware. It does not list any original finish products.
While vendor inventory may not have been depleted post 2005, it would appear that 2005 was the last year Lodge made any original finish (non-seasoned) cookware for sale. Starting in 2006, it was all pre-seasoned.
This thread:
http://www.griswoldandwagner.com/cgi-bin/yabb/YaBB.pl?num=1251495938/allwas bumped up by Cheryl a while back. There are 2 different themes running through it. One is finish in terms of grinding or polishing, which according to Lodge ended in 1997. Note that the 2000 catalog PDF posted still mentions polished skillets are available.
The other discussion tries to determine when Lodge stopped offering plain finish items (non-seasoned), making the change to all pre-seasoned cookware.