Order of the Auspicious Clouds Technical Marks

These marks usually hide behind the central obverse tablet.

Fortunately (or unfortunately - depends on the perspective taken) screws often become lost.

Mark "0".

Another example of mark "0".

 

Additional examples of mark "0".

 

Mark "2".

 

But not every order of the Auspicious Clouds has such mark.
Example of unmarked specimen.

 

Mark "丄" + Mark "3".

丄 = 上 = upper part.

Cased 4th class.