Free Art Appraisal Sotheby's

Okay, let's tackle this query about "free art appraisal Sotheby's." The user wants a comprehensive article covering eight specific aspects. First, I need to understand what exactly Sotheby's offers. From the search results, it looks like Sotheby's provides complimentary auction estimate valuations, not full appraisals. They mention this in sources [2], [4], [5], and [7]. The distinction between an appraisal and an auction estimate is important here. For the historical background, Sotheby’s has a long history dating back to 1744, as noted in [9] and [11].