Pressure Treated Pine fence

This is a fence that i built in the Historic part of town.The homeowner designed the fence and i took on the process of building it.It was one of the most time consuming fences that i had built up until that time.The Gate and the posts around it are 6×6 and the rest were made of 4×4.The rails were made of 1×4 for the 2 top rails and a 1×6 for the bottom rail.The pickets were made of 2×2 We cut blocks to fill in the spaces between all the rails and pickets.The left the fence to turn and looked old i could not convince them into putting any
kind of sealer to preserve it.