Its great to see those old boards. I have a red cedar shingle that measures 16-1/4" across. It has a 4x4 square paper sticker on it from the mill. I am guessing from the 40s or 50s.
So without being able to count growth rings, if these boards were harvested in 1694, they could conceivably have been growing in the 1500s, maybe 1400s.
“Americans have the right and advantage of being armed, unlike the people of other countries, whose leaders are afraid to trust them with arms.” – James Madison.