Battery Specs:

• 100% Brand New Authentic Seizaiken Battery in blister cell packaging
• Also Compatible with: 348, SR521SW, Seiko SB-A6, Citizen 280-77, IEC SR421SW, GP348, V348
• Compatible for cameras, calculators, watches, toys and other electronic devices
• Output: DC 1.55V
• Chemistry: Silver Oxide
• Diameter: 4.8
• Thickness: 2.15
• Capacity: 12
• These batteries were manufactured less then a year a go and they have a shelf life of over 5 years so they are 100% fresh. There is no expiry date print on the packaging

Japanese Equivalent: SR421SW