According to Pelikan’s Perch, both bulb filler and piston filler model were produced until their discontinuation in 1945⁽¹⁾.

There exists bulb filler Rappen that has "IBIS" CN nib instead of "Rappen" nib (Pelikan’s Perch) (Fig.1). As CN nibs were introduced in 1939 due to war economy (click), the pen is thought to be a wartime pen⁽²⁾.

Note;⁽¹⁾As of 1945, Rappen was no longer mentioned in any price lists, suggesting that the model was discontinued in 1945 or earlier.
⁽²⁾Whether the nib was original for the pen or replaced afterwards is not clear.