Montblanc newspaper ad

This advertisement is from Berlingske Tidende, December 24 of some year… I bought this single newspaper page at a flea market this morning, and the year is no where to be found on it… There’s some sleuthing to be done based on the content on the rest of the page…

The text on the left says

“Self-filler,
New construction.
No mechanism to squeeze the rubber sac like other self-fillers”

This is a little strange to me. It might be talking about the Compressor models that Montblanc made from 1924 – 1929. However, the drawing looks more like a Safety Pen (because the cap threads are so close to the nib). This would mean that it’s not a self-filler. The Montblanc Safety Pens were made from 1920 to about 1937, so it’s in the same time frame as the Compressor.

My best guess is that the illustration is not the pen they’re talking about in the text. But that doesn’t help me nail down the exact year of this newspaper. My current best guess would be sometime in the mid-1920s.