Finding value of old used cars with no comps? 1999 Mustang GT Convertible 35th anniversary

[HersheySweet]

Reference this thread too, lots of good advice there

2004 Corvette Convertible 14,500 miles

Do a nationwide search on Autotrader and see the asking price on comparable Corvettes for sale. May want to check Bring a Trailer for current or past sales data along with EBay Motors.