#calibre 8900

The Omega Seamaster Diver 300M gets the Bond fame, but the Planet Ocean 600M is the real diver's Seamaster: double the depth rating, a more substantial case, a ceramic dial and bezel, and a dual-barrel caliber 8900. It also lives in the 300M's shadow, which is exactly why it is the better pre-owned value. A working dealer's read on what separates the two, the newest 42mm generation, the size traps to avoid, and why Omega's real diver trades for less than its famous sibling.

The Omega Aqua Terra trades 30–45% below retail pre-owned while carrying METAS Master Chronometer certification, 15,000 gauss magnetic resistance, and a Co-Axial movement rated to 0/+6 seconds per day. A dealer's case for why the dress-sport hybrid that doesn't depreciate like one is the value story most buyers are missing.