I Show copy of box and slugs
I use the timeframe “before 1930”, because in 1930 they have again a new Modell, than with 12 longitudenal ribs and a raised nose in front of the bullet.
Otherwise same construction, except they have a raised markings around the raised bullet nose, which reads than 20 Orig.Brenneke 20 Mod.1930
Pics from this I will publish later…
I do have the same in Calibre 20 and 24 Gauge