Must See: Omega Speedmaster Professional ref. 145.0052 yellow gold limited edition.
I love 18kt Speedies.. And this one looks particularly good. Limited edition made in 999 pieces to commemorate the 50th anniversary of the 27CHRO movement, the base caliber for the 321.
Seen at NewOldTime: http://www.newoldtime.it/default.aspx?g=posts&t=423