[Seaplanes]

The only unit to operate the Heinkel He 59 in larger numbers in Norway, was the K.Geschwader z.b.V. 108. They started operations on 9. April 1940 from bases along the North-Sea and Baltic shores in Germany. Most of the aircraft in this unit carried four-letter Stammkennzeichen, but a few is known to have carried their former unit codes like 8L+.
The unit code 7U+ was introduced in the spring of 1942 for aircraft in the K.Gruppe z.b.V. 108 (later T.Gr. 20). This unit was formed in June 1940 from the remainder of K.G.z.b.V. 108, K.Gr.z.b.V. 106 and 107.
In addition the Seenotdienst flew He 59's from Norwegian bases for quite some time from late April 1940.
From the information given, it is impossible to tell from what unit the plane in your photograph comes.