[unsupp0rted]

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.

[plausibility]

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.

[gwervc]

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.

[kalleboo]

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

[jurmous]

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

[tylrprtr]

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

[tedd4u]

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