watch band and charging device
I have an original, series 1, iPhone. I want to buy a series 7. Will my old watch band fit the new phone? Will my old charger work with the new phone?
Apple Watch
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You can match most bands with any Apple Watch Series 3 or newer case of the same size. The 41mm bands work with 38mm and 40mm cases; the 45mm bands work with 42mm and 44mm cases. I believe the same holds for the series 1 watch.
The old charger & cable should work although you will lose the fast charging feature. Since I charge mine overnight, every night that feature is not that important to me.