Titleist - 990 DCI
1999

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This was the era before they started adding dampers and inserts all along the back. Very clean design. My understanding is that there were available new from 1999-2000.

The stlye is clean and these club age pretty well. No rust or flaking to complain about.
These used to be in my bag and I really enjoyed them. They might not be the most exciting clubs on the planet, but they sure get the job done.
Titleist usually come out with great irons - I can not think of a bad Titleist set...