Looks like a Kahler Trem System.
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Definitely not a Kahler flat mount. I replaced the whammy on mine with a Kahler for most of the time I owned it. A Kahler has an axle that rolls the strings back over fixed rollers. This is really a very fancy knife-edge trem with self contained internal springs. There is no back cavity like a Strat or Floyd style bridge. Just a massive front rout.