This is a late 70s photo of the New York Knicks playing the New Jersey Nets. From the scorer's table in the background, it appears that they are playing in the Capitol Centre in Washington, D.C.
In the 50s, NBA teams would play double-headers with 4 different teams at Madison Square Garden. Was this done in the late 70s? Is this a pre-season game?
Also, notice the lack of NOBS on the Nets' shirts...