The common sizing with the past few series before that was 40mm and 44mm, and that still applies to the Apple Watch SE. The 41mm Apple Watch will get the job done with bands within the 38mm and 40mm products, along with the 45mm Apple Watch will work with bands https://which-strap-for-apple-wat39516.blog-a-story.com/6526504/5-simple-techniques-for-coach-40mm-apple-watch-band