I don’t have an exact date for these pencils but there are some clues. The packaging and design share some features with this box, which I believe dates back to the ’20s. This announcement, dated 1921 from Eberhard Faber, mentions their Sales Book pencils:
Since these pencils are polished gray, then they were likely made prior to 1921 (NB – I wonder what a “steno shading pencil” is).
This is the first gray-polished pencil I’ve seen, at least from this time period. Looking closely you can see two different shades—I wonder if this had something to do with the switch to yellow polish.