Re: Takamine TG-001
You are VERY LUCKY (assuming the kind elderly lady did not charge much for the guitar!)
That is indeed a rare vintage model that Takamine produced in very limited numbers. As a local guitar shop owner in Merced, Ca, I would easily value that guitar at upwards of $2,500 USD (and I am saying that estimate with the guitar being in okay condition) more pristine models can easily fetch $3,000 on Ebay.com and I recently saw on listed on Craigslist.org for about $1,700 (which was A STEAL)
Definitely keep the guitar as the tone it produces is phenomenal!