What do appraisers do when they have no clue about an item?

What happens when an appraiser comes across an item they have never encountered before? How can they properly valuate it? For instance, my family owns an antique from our home country worth thousands. But the closest facially similar American item is worth only a few dozen dollars. Or what about an item they... show more What happens when an appraiser comes across an item they have never encountered before? How can they properly valuate it?

For instance, my family owns an antique from our home country worth thousands. But the closest facially similar American item is worth only a few dozen dollars.

Or what about an item they genuinely have no idea about?
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