Seiko uses the Superior and VFA brands to indicate specially tuned movements.

Seiko uses the initials VFA to indicate a movement tuned to high accuracy. This is typically included on the dial of the watch, often as V.F.A..

• Cal. 38SQ
  • Cal. 3820 +/-15 second per month
  • Cal. 3823 +/-5 second per month
• Cal. 39SQ (1973-1976)
  • Cal. 3923 (1973-1976) +/-5 second per month
• Cal. 45
  • Cal. 4580
• Cal. 61
  • Cal. 6185A
  • Cal. 6186A

Superior is a brand name used by Seiko to indicate specially-tuned watches with high accuracy. It is similar to Seiko Special and was also sometimes called GFA to position it above Seiko VFA.

• Cal. 38
  • Cal. 3882 +/-1 second per month
  • Cal. 3883
• Cal. 48
  • Cal. 4883A/4883B (1976-1978) +/-10 second per month
• Cal. 94
  • Cal. 9481 (1983-1984) +/-5
  • Cal. 9483 +/-5
• Cal. 96
  • Cal. 9681 (1983-1984) +/-5
  • Cal. 9682 +/-5
• Cal. 99
  • Cal. 9980 (1980-1984) +/-5
  • Cal. 9983 (1978-1984) +/-5
• Cal. 8N
  • Cal. 8N91 +/-5