What is the meaning of は in this context?


Context: A car approaches ルパン, 次元 asks over the radio who is in driving it

次元「ルパン、スコーピオンか？」

ルパン「いやぁ、違う。我が宿命のライバル。ご存じ警視庁 **は** 銭形警部さ」

I can't tell what は is supposed to mean in this context, is it the same
meaning as の? If so, how common is this usage?

