Seiko is a Japanese watch company that began in 1881. You can resize your Seiko by removing a link to make the watch band smaller or adding a link to make the watch band larger. Adding or removing a link is a simple process that does not require experience working with watches.
Set your watch on a soft cloth to protect it from getting scratched while you are resizing the band.
Turn the watch on its edge so the links are facing up. Look on the inside of the links and you will see arrows on the few links on each side of the clasp. These arrows point in the direction the pins must be pushed out. If you look on the edge of the links, you will see tiny circles, which are the pin heads. The pins hold the links together but only the three or four links on each side of the clasp can be removed for resizing purposes.
Place your pointed tool on top of the pin head near the base of the arrow. You can choose any link with a removable pin. Push down on the tool in the direction the arrow is pointing until the pin comes out of the bottom. If you need to remove a link, remove two pins. If you need to add a link, you only need to remove one pin. You can use a pointed tool from a hobby kit or a thumb tack.
Remove the loose link, if you need to make the band smaller. You will now have one extra link and one extra pin. Save these in case you need to use them again. Reattach the band by sliding the detached links together, so that the pin holes on the links align.
If you need to add a link, slide the new link into the gap in the band, so that the pin holes on the links align.
Insert a pin into the pin hole to reattach the band. If you are adding a link, you will be inserting two pins, the pin that you removed and the extra pin that came with the extra link. If you removed a link, you will only be inserting one link. You can use your fingertips and your pointed tool to push the pin in the link. Remember to push the pin down in the direction the arrow is pointing. The pin head will be flush with the edge of the link when it is completely inserted.