Advice On Appraisals (Antiques) Wanted

My unlcle passed away last August-he was a guy who collected all kinds of stuff. For most of his life he ran a bar/pub, and accumulated a huge assortment of stuff-some of it valuable, most of it junk.
My aunt could really use the cash-so I have been telling my aunt to catalog the stuff and have a professional appraise it.
For the record, he has stuff like a glass Pairpoint lamp (could be worth >$4,000, an antique barber pole sign, tons of plumbing tools and fixtures (some dating back to the 1920’s), a collection of antique framed prints, mission furniture, and several antique radios and phonographs.
How would I find an expert to appraise such an ecelctic collection?

Was it not appraised for Probate and Inheritance Tax?