Watch To Watch: Grand Seiko Introduces Two US-Exclusive – SBGA507 & SBGA509 — Frasspot,Grand Seiko's first mechanical complication combines a constant-force mechanism and a tourbillon as one unit on a single axis. | Grand Seiko,Watch To Watch: Grand Seiko Introduces Two US-Exclusive – SBGA507 & SBGA509 — Frasspot,SOLD , Rare Seiko DX automatic Day-Date, Portugal export variant, 100% working. Genuine cal 7019, 21J self winding movement in immaculate condition. Original dial & hands in almost MINT CONDITION. ,Grand Seiko Kodo Constant-Force Tourbillon. @delugs #grandseiko