I have 6309-7040 that I really love. I actually can't believe the quality of the watch for the price I paid! I have it on a yobokies anvil bracelet, but would like to upgrade the clasp if at all possible. Does anyone know of options for upgrading claps, maybe to a marinemaster clasp, on any bracelet that could fit a 6309? And it doesn't have to fit my anvil, as I might be willing to switch bracelets.