Taurus changed things as far as there "Find My Model" search goes. Unfortunately it was not for the better since a lot of older Tauri are now excluded. Taurus USA also wiped out their archived models that were stopped being produced. Those were good sources of info.
Taurus model 669: Similar to model 66, but has full shrouded barrel. 4 or 6 inch barrel. Blued. 37 ounces. Discontinued in 1998. Vent ribbed barrel manufactured from 1989-1992. Laser Aim Sight offered 1992-1992. Worth: 100%:$285; 98%:$250; 95%: $215; 90%:$185 Vent rib add $10. End of quote. This is from the Blue Book of Gun Values.