Apple AirPort Base Station M5757 (Graphite)

The Elan cpu on CPUWorld

Running Linux on the Apple Airport Base Station

Per the above link, the CPU is by default clocked at 16MHz (though 33MHz capable).

Sharing Apple Base Station Experiences

On whirlpool.net

Disassembly of Apple Graphite Airport Base Station HD/720p on YouTube

"02761-535-D004" and "REV : 1" is silkscreened on the board.