Vintage example found but it is milkglass (seaglass versions are clear) & lettering is not offset, so similar but not the same. The mystery deepens!
www.instagram.com/p/DaoGT6yzJy...
Works just like the mobile app.
Install this app on your iPhone: tap the share button and then Add to Home Screen.
Tap the Share button
in Safari's toolbar
Select "Add to Home Screen"
from the menu
Tap "Add"
The app will appear on your home screen
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