Replica Omega Seamasters are relatively common.  They come in a variety of grades, from poor Asian trash, to high quality ETA-based models.  With Omegas it pays to know what you're looking for.  Many fake Omegas have inaccurate backs or dials.  They may 'look' good, but any Omega buff would spot these flaws early.

OMEGA Seamaster

Compare to Genuine Omega Seamasters on eBay

BUY!! OMEGA SEAMASTER PLANET OCEAN XL AUTOMATIC WATCH US $4,395.00 Auction Ends: End Date: Wednesday Mar-10-2010 9:31:28 PST Add to watch list

AUTHENTIC OMEGA SEAMASTER 300m 2531.80.00 MENS WATCH US $1,299.99 (1 Bid) Auction Ends: End Date: Wednesday Mar-10-2010 9:31:52 PST Add to watch list

Vintage Omega Seamaster De Ville Automatic, NO RESERVE US $255.00 (5 Bids) Auction Ends: End Date: Wednesday Mar-10-2010 9:41:14 PST Add to watch list

NEW OMEGA SEAMASTER PLANET OCEAN AUTO WATCH 2201.51.00 US $2,895.00 Auction Ends: End Date: Wednesday Mar-10-2010 10:03:59 PST Add to watch list