I agree with Petert4522 that is is a town name (straight-line town cancellation).
This is the sub post office 'NES' of the Dokkum post office located between Wierum and Paesens/Moddergat. It opened 1 oktober 1870.
http://poststempels.nedacademievoorfilatelie.nl/Scroll to "15a Kantoornaamstempels Naaldwijk t/m Nieuwdorp (ZL) kunt u hier bekijken."
Click on the word "hier" and go to page 21.
https://en.wikipedia.org/wiki/Nes,_...Frysl%C3%A2nI believe this is the one Jan is referring to.
There are about five or six places called Nes.
The name refers to a headland that will have existed at those locations.