Apple has stopped selling three older versions of the Apple Watch: The Apple Watch Series 3, Series 7, and SE (1st generation).
Apple Watch generations: A guide to the different Watch models
Apple has stopped selling some Apple Watches on its website because of patent dispute
Apple Watch Series 6 discontinued as the company makes way for Series 7
Apple Watch Series 3 vs Apple Watch Series 2: should you upgrade?
Apple Watch X rumors: Expected release date and what we know so far
Apple's $10,000 Apple Watch Is About to Be Obsolete
The Apple Watch Series 7 and SE were the world's best-selling smartwatches in Q1 - PhoneArena
Apple: This $17,000 Apple Watch is now obsolete - Times of India
Don't Buy an Apple Watch Series 3 Right Now: It's About to Be Discontinued - MacRumors
Apple Watch Series 3 vs. 6: What Are the Differences?
Apple Watch series3