Seiko SAGV007 "Big Date" Titanium Perpetual CalendarModel: Seiko SAGV007 7D48 0AD0 Year: August 2006 Features: The Design. Produced for a brief period in 2008 and exclusively sold in Japan, this has become the grail Big Date for most Seiko collectors. A quintessentially accidental limited edition from Seiko, as its sudden discontinuation has made them very hard to find. Its dial is dark ivory with a subtle sunburst effect, and it's recessed subdials achieve a similar sunburst visual through their use