The Seiko 3Y03-0B4B is a watch model based on the 3Y03 movement.
Parts List
| 190W46HN01 | crystal |
| 190W46HN | crystal |
| 35MF6NA1 | crown |
| FH2081B0A | case back gasket - case back gasket |
| EA0040B0 | case back gasket |
| 86581860 | crystal gasket - plastic gasket for crystal |
| 86179080 | bezel gasket - plastic gasket for bezel |
| B5625L | band |
| B5625L-LKG | band - link |
| B5625L-PB1 | clasp - parts for buckle/clasp |
| B5625L-BK1S | clasp - clasp |
| 07SC02NG | others - second hand |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 0801752 | others - date dial |
| 0866553 | others - holding ring for dial |
| 3Y030B4B | others - case back |
| 3Y030B4B98Z | others - case |
| 3Y030C4WXS14 | others - dial |
| 3Y037 | others - machine code |
| 82390266 | others - ornament bezel |
| 82801600 | others - case ring |
| 0351546 | others - winding stem |
| EA0040B0A | others - crown and stem gasket |
| 07T20LGM | others - minute hand |
| 07T20LGH | others - hour hand |
| 190W46HN01 | crystal |
| 190W46HN | crystal |
| 35MF6NA1 | crown |
| FH2081B0A | case back gasket - case back gasket |
| EA0040B0 | case back gasket |
| 86581860 | crystal gasket - plastic gasket for crystal |
| 86179080 | bezel gasket - plastic gasket for bezel |
| B5625L | band |
| B5625L-LKG | band - link |
| B5625L-PB1 | clasp - parts for buckle/clasp |
| B5625L-BK1S | clasp - clasp |
| 07SC02NG | others - second hand |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 0801752 | others - date dial |
| 0866553 | others - holding ring for dial |
| 3Y030B4B | others - case back |
| 3Y030B4B98Z | others - case |
| 3Y030C4WXS14 | others - dial |
| 3Y037 | others - machine code |
| 82390266 | others - ornament bezel |
| 82801600 | others - case ring |
| 0351546 | others - winding stem |
| EA0040B0A | others - crown and stem gasket |
| 07T20LGM | others - minute hand |
| 07T20LGH | others - hour hand |