Pulsar
Calculator Y739
1979. Truely wonderful calculator watch in gold on stainless. In true Pulsar style this watch contains a handy button pointer in the clasp.
Seiko
C153-5007
1977. The calculator feature merges with the day and date display on this iconic watch from the late 70's.
Seiko
C515-5009
1983. Chunky calculator memory watch with large buttons (can even be used with a finger)
Seiko
Data 2000 (UW01-0020)
1984. Classic Data-2000 'computer' watch with dot matrix display in black with separate contoller keyboard.
Seiko
Data 3000 (UW02-0020)
1984. UC-3000 'computer' watch with dot matrix display in black with separate contoller keyboard.
Seiko
C359-5000
1979. The second attempt at a calculator from giants Seiko. Not there best but still a good watch.
Seiko
6138-7000 (Calculator)
Good Seiko auto featuring not only day, date and chrono but also a fantastic rotating slide rule bezel