Casio CA-53 in The Dark Knight! I knew about the CA-53 being in Back to the Future and in Breaking Bad, but being in the TDK makes it even more appealing :) :
Casio CA-53 Calculator Watch - My In Depth Review of a Classic Which is Still Available Brand New - YouTube
Casio CA-53WF-8B Calculator Beige Digital Mens Watch Original New Classic CA -53の通販はau PAY マーケット - BigBalloons