I have a handful of Cobras, 93-04 and have watched values creep upwards on all of them. Mine are all low-volume 1-year only cars, which boosts values. Cool cars and limited availability = a worthy place to throw money - if you are inclined to throw money at cars.
Good to see, but that's only over a time of 10 days. Too small of a sample to judge it by. A couple people in your area may have sold their Cobra for slightly over market value, to bring up your local value 3%
They certainly seem to be going up in the midwest. But availability also seems lower than normal. Bump may just be artificial due to temporary market forces