I know this was posted a while ago but I was just looking, yesterday, at Harveys from Devon. There are a substantial number. The particular Harveys I was looking at, are in the Devon/Dorset/Somerset border area, not in the Dartmoor border area exactly. But I have seen some from Teignmouth, e.g. If any interest, I'll pull together what I have.
BTW, a lot of Devon/Dorset wills that might have been helpful were destroyed in WWII. Some do survive and the Wilshire and Swindon archive, digitised now by Ancestry.