I have different styles of back packs that are property marked to the Railway Police, regular police, Bavarian, & Land Police.  If putting together a NS period mannequin I would look for one that is marked but accept one Army marked as the Police did sometimes draw equipment from the Heer.  Here is an example of one with all Pollce marked equipment.   BTY, I have a spare Police marked fur box pack if you want to contact me off line.   polblade@aol.com    

Hello,   I got this insignia on a 1953 french helmet pith.   I was wondering if this could be a viet Minh insigna or a a early PAVN one ?    This insigna is metal made.      Thanks    A.S.

https://fumagalli1891.it/blogs/stories/the-regimental-tie?srsltid=AfmBOopO9GGAiqyzeQZWX2ZT9M52Yo-qxJqacqxAzhd8FnGbouUYzFLg

It is magnetic.

Then belts and y straps could be marked the same , I have holsters and firearms police marked , never seen a belt or y straps marked in such a way , I ask that as I am putting together a late war schupo tunic mannequin 

First examine the cross  - multi piece? Magnetic core? Then look at the inscription. Is it period? Is it grammatically correct? I know it is a congratulatory message but that is the extent of my knowledge. 

I'm far from being an expert in Iron Crosses. Is it common to find them engraved like this one? And what does it say?

Navy Rates awarded the IC II   One method as there may have been  more. here the long ribbon is wrapped in a kinda Bow on the side of the neckerchief.

A Colonel Aminto Caretto WWI

QEII At a July 1980 visit to HMS Invincible during her commissioning at Portsmouth, they all, including the Sailor, are partaking in Champagne, we would assume Champagne.

daskrieg is correct.  A lot of police equipment was "Pol" or specifically property marked for independent police departments. Here are some typical Polizei property markings.    

Very nice!  You never know what might pop up at a shop.