I have some new images! Correct me if I am wrong.
So I think this is a Armoured Divison Badge.
I believe this is the same? Collar badge.
2nd Corps Mermaid of Warsaw?
If anyone knows the history of these items (what they mean/ duties in war..etc) I would love to hear them.
Also if anyone knows any history on 156 Pułk Piechoty (II RP) (better information than Wikipedia/ google search) I would be really interested in that.