As of today, all variants of the Apple Watch Series 4 are considered “vintage” worldwide (via MacRumors). This includes the aluminum and stainless steel versions in 40mm and 44mm sizes.

The Apple Watch Series 4, launched in September 2018, is now officially labeled as a "vintage" product. This includes both the aluminum and stainless steel versions of both 40mm and 44mm variants ...

Apple has officially added the Apple Watch Series 4 to its public vintage products list. All aluminum and stainless steel 40mm and 44mm models are now considered vintage worldwide. Apple launched ...