Antidotal "I bought or sold this gun for this much" have no bearing on value of someone else's refinished gun. Photos are an absolute necessity to even come close to a dollar value.
Refinished guns fall into the abyss when it comes to determining value. Some collectors like professional refinishes, while others would not touch the gun at any price. Refinish issues like blurred or partially removed/lightened stampings, buffed and obvious sideplate seams, flattened studs, over-buffed mirror jobs, blued or plated trigger or hammer, blued extractor rod knob, over-the-top color case hardening of trigger or hammer, trigger or hammer total loss of case coloring, worn stocks, non-matching stocks, etc. all greatly affect refinished gun values. I do not even want to make a value statement, but if looking for a standard deduction for refinished guns, be conservative and say they are worth 1/2 original high condition examples.