CaseBack Codes

Read the back of your Seiko.

Type the serial and the code stamped on the case back. We’ll show the possible production month and year, and which watch the code belongs to.

Possible production date, not an authentication.

Families

Six of the families in the full table.

FamilyYearsCaliberCasePrice range
Turtle1976–198863097040, 7049—
Willard1970–197761058110, 8119—
62MAS1965–196862178000, 8001—
Pogue1970–197861396002, 6005—
Bullhead1973–197961380040, 0049—
Lord Matic1968–197856067000, 7010, 7070, 8010—
All families

Latest sampling

First sample due November 2026. We publish ranges only after sampling sold listings by hand, and every range shows its date and sample size.

How we work

  • Codes first. Every page starts from the caliber and case code on the back of the watch, not from a nickname.

  • Sources over memory. Specs come from Seiko technical guides and period catalogs. Anything we can’t confirm is marked as pending.

  • Our own prices. Ranges come from sold listings we review by hand, with the sample size and date next to every number.

Read the methodology

Start here

Reference pages, in the order they go live.

  1. Seiko Lord Matic 5606Caliber 5606
  2. Seiko 6139-6002 “Pogue”Caliber 6139
  3. Seiko 6309-7040 “Turtle”Caliber 6309
  4. Vintage Seiko women’s watchesCaliber 22054206
  5. Seiko Bell-Matic 4006Caliber 4006
  6. Seiko 7A28 quartz chronographCaliber 7A28