We joke around here about the building practices of the folks who built our places. Sometimes they used 1 nail where they should have used 3. Sometimes they used 7 where they should have used 1. You never know until you get inside.
I noticed this row of nails where they had pulled the wood off the side of the old shed I've been telling you about. One nail per board across the tops and another across the bottoms. It was frugal and it held for decades.