1970's-80's Turquoise value

OK,I know there are many considerations when determining a value for Turquoise rough, slabs and cabochons.
I have seen some trying to sell high quality Sleeping Beauty slabs and nuggets for $200.00/lb or more.
Is Sleeping Beauty really worth this?
I am negotiating to obtain a lb. of early 1980’s Kingman and Sleeping Beauty small slabs. The seller said it was from the estate of a Navajo Craftsman .who passed away in the early 1990’s.
To me,the photos he provided look like 1970’s or 80’s material. wouldappreciateany input. Sorry for’ typos. Mycomputerisactingup 1a

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This isn’t my realm of expertise here, but if the image you are showing us is similar quality of what you are trying to buy, I do not believe that it’s worth $200.

What I am looking at getting is not $200.00/lb.
Have seen some that is and was wondering if anyone was familiar with current prices.