How to find the movement number
The movement number is usually engraved on the case back. It is usually in "XXXX-YYYY" format with XXXX being the movement number. In the diagram below, the movement would be 7N01. Once you have found the movement number, please see our reference chart to find the part number of the battery.
Seiko Movement / Part Number Reference Chart
Find the part number that matches with your movement number.
30235MZ -> 30235MY
302729Y -> 3027V1Z
30273MZ -> 30273MY
Caliber | Part # | Caliber | Part # | Caliber | Part # | Caliber | Part # |
1M20 | 302726Y | 5K25 | 302324Y | 7D48 | 302324X | V137 | 302624X |
3M21 | 30273MY | 5K2J | 302324Y | 7D56 | 302324X | V138 | 302624X |
3M22 | 30273MY | 5M22 | 30235MY | 7L22 | 302324T | V142 | 302324Y |
3M43 | 30273MY | 5M23 | 30235MY | 7M12 | 302324R | V145 | 302324Y |
3M62 | 302729N | 5M25 | 30235MY | 7M15 | 302324R | V14J | 302324Y |
4F32 | 303138N0 | 5M42 | 30235MY | 7M22 | 302324R | V157 | 302324Y |
4F56 | 303138N0 | 5M43 | 30235MY | 7M22 | 30235MZ | V158 | 302324Y |
4M21 | 30274MZ | 5M45 | 30235MY | 7M42 | 302324R | V172 | 302334T |
4M22 | 30274MZ | 5M47 | 30235MY | 7M45 | 302324R | V174 | 302334T |
4M61 | 302726Z | 5M54 | 302344Z | 8F32 | 301A95N1 | V175 | 302334T |
4M71 | 302726Z | 5M62 | 302344Z | 8F33 | 301A95N1 | V176 | 302334T |
5D22 | 302324L | 5M63 | 302344Z | 8F35 | 301A95N1 | V181 | 3027V1Z |
5D44 | 302324L | 5M65 | 302344Z | 8F56 | 301A95N1 | V182 | 3027V1Z |
5D88 | 302324L | 5M82 | 302324T | 8F58 | 301A95N1 | V187 | 3027V1Z |
5J21 | 302324X | 5M83 | 302324T | V102 | 30273MZ | V198 | 302324D |
5J22 | 302324X | 5M84 | 302324T | V103 | 30273MZ | VS10 | 302726T |
5J23 | 302324X | 5M85 | 302324T | V110 | 302726T | VS32 | 302324Y |
5J32 | 302324X | 5S21 | 302324X | V114 | 302726T | YT52 | 30235MY |
5K21 | 302324Y | 5S22 | 30235MY | V115 | 302726T | YT57 | 30235MY |
5K22 | 302324Y | 5Y75 | 302324P | V121 | 302324R | YT58 | 30235MY |
5K23 | 302324Y | 7D46 | 302324X | V122 | 302324R |