For model: SEIKO 6309-729A diver

We don't have a caliper to measure exactly but the closet approx measurement we can get on a regular ruler is:

Inside diameter: 27.5mm
Outside diameter: 30.5mm

Made especially for the 6309 diver. These high quality chapter rings are made of ABS plastic, and painted to precision.

When modding (customizing) your favorite Seiko watch, sometimes just changing the hands isn't enough. That's where a subtle change of color of the chapter ring can go a long way in enhancing the overall look and uniqueness in it's appearance.

Whether you're putting together that one-of-a-kind mod. Or just oh-so subtly want to give your existing stock an accent with that subtly "something extra". Then these chapter rings are for you. Just press them into the recess in the case for drop down installation.