The Seiko 3Y03-0031 is a watch model based on the 3Y03 movement.
Parts List
| 190W53LN | crystal |
| 190W53LN00 | crystal |
| 32M29NA1 | crown |
| 32M29NS1 | crown |
| 32M29NN1 | crown |
| AC004BA1 | case back gasket |
| FH1980B01 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| 86564110 | crystal gasket - plastic gasket for crystal |
| 86590910 | bezel gasket - plastic gasket for bezel |
| G5157C | band - metal band |
| G5157C-LKG | band - link |
| G5157G | band - metal band |
| G5157G-LKG | band - link |
| ZJJ43G | band - leather band |
| G5115S | band |
| G5157S | band |
| G5115G | band |
| G5157G-PB1 | clasp - parts for buckle/clasp |
| G5157G-BK1G | clasp - clasp |
| G5157C-PB1 | clasp - parts for buckle/clasp |
| G5157C-BK1S | clasp - clasp |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 3BA125F1BNG | others - second hand |
| 07SC43NG | others - second hand |
| 07SC43NS | others - second hand |
| 3BA125F1BNS | others - second hand |
| 0351546 | others - winding stem |
| 0801752 | others - date dial |
| 0884155 | others - holding ring for dial |
| 3Y030031 | others - case back |
| 3Y03003161 | others - case |
| 3Y03003175 | others - case |
| 3Y03003198 | others - case |
| 3Y03034LXG14 | others - dial |
| 3Y03034LXS13 | others - dial |
| 3Y03035LXS19 | others - dial |
| 82341551 | others - bezel |
| 82341559 | others - bezel |
| 82821110 | others - case ring |
| A130BS | others - push pin |
| 08SC29NS | others - second hand |
| 08SC29NG | others - second hand |
| 08S13MSM | others - minute hand |
| 07SA7MSM | others - minute hand |
| 07SA5BGM | others - minute hand |
| 07SA5BSM | others - minute hand |
| 08S13MGM | others - minute hand |
| 07SA7MGM | others - minute hand |
| 08S13MSH | others - hour hand |
| 07SA7MSH | others - hour hand |
| 07SA5BGH | others - hour hand |
| 07SA5BSH | others - hour hand |
| 08S13MGH | others - hour hand |
| 07SA7MGH | others - hour hand |