Vintage 1967 Seiko Business-A Day-Date 8346-8000
The Business-A was Seiko’s smart 1960s executive line, made for the Japanese domestic market only.
This 1967 example of the stylish 8346-8000 is in excellent condition, with just a couple of minor
nicks, light cuff wear and a very clean, bright movement with no surrounding case corrosion or pitting.
All three hands and the creamy dial with vertical brushed-silk texture (which doesn’t show up well
in the photos) are in great shape. The applied SEIKO logo and the thick, ‘60s-style, brushed-metal
day/date frame are both bright and unmarked.
The original unsigned crown winds and sets smoothly. Service history is unknown, but the automatic
27-jewel movement is running well, losing only a few seconds a day (any watchmaker can adjust it),
with amplitude around 250 and beat error at 0.1ms.
Facts & Figures
Production date: February 1967
Case: 37mm x 12mm
Lug width: 18mm
Lug to Lug: 42mm
Movt: Automatic Seiko 8346A, 27 jewels, non-hacking, quickest date/slowset day (Kanji only).