Seizaiken
Pack codes printed by Seizaiken, linked to the standard battery sizes on this site. Not affiliated with or endorsed by Seizaiken.
Official technical resources: www.sii.co.jp/en/
Pack codes we list
Seizaiken SR626SW · silver-oxide · 1.55 V
Watch pack code 377. W and SW variants are not always interchangeable — check your watch model.
Sources
- Seiko Instruments — batteries · checked 2026-10-12