Just saw this movie today. Notwithstanding the reviews on the site in the previous posting, I thought it was very good indeed. A very moving tribute to New Yorkers, in many respects. The young lead (Thomas Horn) is remarkable, and Max von Sydow -- well, I can watch him all day, even when he isn't speaking (and in fact his part is mute), and he's up for an Oscar.
Now -- yes indeed, that's an Exakta V, with what looks like a CZJ Tessar, and it plays an important role in the movie. I got a big kick out of seeing it. I'd like to know whether the book specifies the camera or not, since the back story is that it's the kid's grandfather's camera, and he was from Dresden. (Camera geek quibble -- if the camera was supposed to have been acquired in Germany, it would have been a Varex -- V was the export version of that model.)