That price you paid was excellent and Best buy considering Takamine H20 was a new or mint condition.
Most guitar had Brazilian rosewood or Jacaranda wood on their back and side fetched a very high price tag in today world.
The photos of Takamine No.15 still on sales on e - b a y by seller called "VictorK1962" for USD$2,500 but it does not had Jacaranda wood.
here is the link to the advertisement of Takamine No. 15 on e - b a y.com
https://www.e - b a y.com/itm/MADE-1980s-TAK ... 2f2efcfa7e