Dear Tom, Egbert Harms Schuur is not in my line. But if you check the family line on de web address I have provided you, you can read about Geert Harms Schuur, born in 1742 in Germany, who lived in Eexta (now Eext), roughly 5 miles from Oude Pekela.
It seems that Geert Harms Schuur came from Lipsland in Germany. Lipsland is the area around the town Lipstadt, a place between Muenster and Bielefield, nearby the Dutch border.
Maybe Egbert Harms Schuur was related to Geerts Harms, but I cannot tell.
At the bottom of the page I have mentioned in my earlier posting are the contact details of G.H.Schuur, who investigated the Northern (groningen) Branch of the Schuur Family.
Good Luck in you search, Kees
As far as I know there is no information found (of wasn't been searched for)