"La Jetée" is French for a pier, a dock, and yes, a jetty. It can also mean a passageway or an observation deck, which is where the pivotal event of the film takes place.
The Pentax Spotmatic, which is a 35mm single lens reflex (SLR) and manufactured by the Asahi Optical Co. Ltd, aka Pentax Corporation: http://basepath.com/Photography/Spotmatic.php.
This was shot with a 35mm Arriflex: http://www.cinematechnic.com/resources/arri_35-2.html.
