A riddle:

I have a bronze keyboard Powerbook with a black plastic case. The identification sticker on its derriere states that it is a G4/6Gb/64Mb/video/DVD ... but I'm told by a retailer from whom I negotiating to buy some RAM that: "the only G4 PowerBooks are ALL Titanium. The G3 Lombard/Wallstreet had a bronze keyboard."

What have I got?