Prescotts are over 150 years old at the earliest and some closer to 180-190 years old. Even if they have been worked on or modified with a Block does not mean the Block or graft is still good.
The one I bought needed a new Block and Graft and neither was original. The Upper and middle bout cuts were fine but it still needed to be reduced to just under 42" string length.
Mine was in fantastic condition for both its age and it being a Prescott. Many Prescotts are a total mess. Some are huge and some of the first ones were made as large Cellos the size of a 4/4 Bass. These are the least desirable as Cello shouldered Basses are no fun to play.
I saw two in the last 2 years and they were offered to me for sale. Even if I got them for free, it would be a risk financially after a full restoration.