Vintage Seiko Stainless Steel Day Date Chronograph Model Number 6138-0017. The case is 45mm in diameter. The dial is black featuring baton applied lume hour markers and tachymeter. The caseback is stamped "STAINLESS STEEL 6138-0017 WATER RESISTANT 248005 JAPAN J SSA 539-36-9513". This Seiko is accompanied by a stainless steel bracelet with a stamped "SEIKO" clasp. The case serial is 248005. Condition: (Good).