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Mine doesn't seem to. I have a US Apple Watch that I use outside the US all the time. Non-US account/app store too.

My understanding is it's like iPhone purchased in Japan always having the shutter noise no matter where they're taking a picture.

Apple Watches purchased and activated in USA after the patent lawsuit cut off date won't have the feature enabled, even if you travel or move.

That's plain wrong. iPhone uses sim data or something to enable/disable that noise. Source: myself with two iPhones bought in Japan and used both there and in the EU.

This is a recent change, until about 3 iPhone models ago it worked how GP described it

I was reading it is based on the part numbers and it is a different number for US bought watches.

If number ends with LW/A you will not have it

https://support.apple.com/en-us/120359

This is correct. You could order a Series 10 from a Canadian source and have a working blood oxygen sensor.

Can verify this works. Use reship.com to get a Canadian mailing address and have it forwarded.

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