Chainsaw Repair

Hey guy's, I cobbled up another saw over the weekend.
CST610EVL Echo.
Guy said it got too heavy for him to carry some years ago and if I wanted it take it.
Been sitting under his work bench for 10-15 years he said.
I would like to know how old it is ? And how long were they in production ?
Soon as the holidays are over I will get out and look into getting it running again.
I will also see if I can get some pictures posted if yall interested.....