The Seiko 6309 diver watch is a model that was manufactured between 1976 and 1988. It remains popular among watch collectors and vintage watch enthusiasts today.
If you want your Seiko 6309 to be more unique, you can dress up our solid 316L stainless steel watch bracelet. It is design for Seiko Scuba Diver 6309-7040 & 6309-7049 models or other 22mm lug Seiko diver or sport watch case with the same curvature as the above models.
There are Endmill, Super Jubilee and Super Oyster watch bracelets to choose. These are a good choice of Seiko replacement watch band for your 6309-7040 & 6309-7049.
They are available here and see more details.