Help needed to identify handwritten Notes in a Pickelhaube

[Sandmann]

Hi Guys,
one more time I need your Help [-o<
I tried to identify pencil written Notes in my Pickelhaube. I guess it is in "Suetterlin" or in a similar styled old german Handwriting, but I'm not able to read it.
I'm pretty sure that I got the Name: "Hagen" and an abbreviation "IR...." for an Infanterie-Regiment. But the rest is a mystery for me
I attached some pictures. For some Images I tried to improve the readability by playing with color and contrast.
Is anybody skilled in reading old Handwritings like this? Thank you very much for your help and your time

https://picload.org/image/rwoirair/img_0391.jpg" onclick="window.open(this.href);return false;

https://picload.org/image/rwoiraia/img_0403.jpg" onclick="window.open(this.href);return false;

https://picload.org/image/rwoirail/img_0403.jpg" onclick="window.open(this.href);return false;

https://picload.org/image/rwoiraii/img_0407.jpg" onclick="window.open(this.href);return false;

https://picload.org/image/rwoirapr/img_0387.jpg" onclick="window.open(this.href);return false;

https://picload.org/image/rwoiraiw/fullsizeoutput_b1b.jpg" onclick="window.open(this.href);return false;

https://picload.org/image/rwoirapl/img_0399.jpg" onclick="window.open(this.href);return false;

https://picload.org/image/rwoirawr/img_0411.jpg" onclick="window.open(this.href);return false;

 

[kaiser]

Witch plate is atatched to this helmet that would be helpful to determen what regiment is refered to in this case
Could be IR9/3 but then it schould beare a bavarian plate
On one of your fotos you can even see berlin stamped on the inside of the spike (second and third foto)first time to see this been done its a little detail but its there

Jonas

 

[Sandmann]

Thank you for your Help. It is a prussian Plate. Could it be like this?

Picture 1: "Hagen"
Picture 2,3 and 4: "H" or "Lt" (it's an Officer-Helmet) and then "IRgt 31"
Picture 5,6 and 7: "KH" (Initials again?) and Helmsize "58"

I found a "Karl Hagen" in the List of fallen Soldiers. He was a Member of IR 31.
There is another Notice which I forgot:

https://picload.org/image/rwoiracw/img_0389.jpg" onclick="window.open(this.href);return false;

Could this be "Karl"? It looks a little bit like like "K or k a ... l", but is it scored out or just a Signature-Style?