The shipping watch band of the F6x sapphire has notches while the older style band has a nicer feel, thankfully was able to quickly swap. If you are purchasing for the pulse ox (assuming the battery is at 100%) turning it on will take the battery from 21 to 15 days.
https://www.amazon.com/Garmin-Sapphire-Multisport-features-Grade-Adjusted/dp/B07W59LRL9

