The main distinctions between the varieties are:
    
        
          | Format | Form number | Front slogans | Rear slogans | Flap | 
        
          | 6A | None | BE PROUD ... and PLAY SAFE ...
 |  | Rectangular | 
        
          | 6B | T.G. 65 c (raised) | BE PROUD ... and PLAY SAFE ...
 | BE SURE... and SEALED LIPS ....
 | Rectangular | 
        
          | 6C | T.G. 65 C | INVEST IN THE ... and SAVE ALL WASTE PAPER
 | BE SURE... and IDLE TALK ....
 | Rectangular | 
        
          | 6D | T.G. 65 C | INVEST IN THE ... and SWITCH OFF ...
 | BE SURE... and IDLE TALK ....
 | Rounded | 
        
          | 6E | T.G. 65 C | SAFEGUARD ... and VICTORY BONDS
 | BE SURE... and THE JOB'S NOT DONE ..
 | Rectangular | 
        
          | 6F | T.G. 65 C | SAFEGUARD ... and VICTORY BONDS
 | BE SURE ... and THE JOB'S NOT DONE ..
 | Rounded | 
    
      
    
      
        |  | AW-EU-6A. Unused urgent rate delivery envelope. Characteristics: 
            no form number;advertisement in top left corner and the three slogans are all war-related;lower slogan is "PLAY SAFE ...". Printing is not straight. | 
      
        |  | AW-EU-6A (reverse side). Characteristics: 
            rectangular flap with straight sides and very broad        (51 mm high);lower slogan is "SEALED LIPS ...". | 
      
        |  | AW-EU-6B. Used urgent rate delivery envelope(24 December 1943 at G.P.O. Sydney).
 Characteristics: 
            has form number in the top left corner;small superscript "C" in the form number - T.G. 65c;advertisement is for "BE PROUND TO SAVE  ...";lower slogan is for "PLAY SAFE ...". | 
      
        |  | AW-EU-6B (reverse side). Characteristics: 
            two war-related slogans. Lower slogan is"
              SEALED LIPS...";
flap has a rounded peak and curved sides.   | 
      
        |  | AW-EU-6C. Unused urgent rate delivery envelope. Characteristics: 
            same boxed advertisement but different formatting;lower slogan changed to "SAVE ALL WASTE PAPER ...". Also known with the lower slogan asLETS FINISH THE JOB ...
 | 
      
        |  | AW-EU-6C (reverse side). Characteristics: 
            same advertisements as on previous envelope but different font size and weight;rectangular flap with straight sides. | 
      
        |  | AW-EU-6D. Unused urgent rate delivery envelope. Characteristics: 
            has form number;both slogans on front for VICTORY BONDS. Envelope badly miscut. | 
      
        |  | AW-EU-6D (reverse side).  Characteristics: 
             two war-related slogans - the lower one for IDLE TALK ....flap has  rounded peak and very curved sides. | 
      
        |  | AW-EU-6E. Unused urgent rate delivery envelope.         Characteristics; 
          boxed slogan in top left corner;lower sloganat the base;lower margin at front decreased to thin line or eliminated.  The first of the slogans printed about or just after the War ended - is advertising VICTORY BONDS. | 
      
        |  | AW-EU-6E (reverse side).   Characteristics: 
          one war-related slogan and one advertising BUY VICTORY BONDS;flap has a rounded peak and slightly curved sides. | 
      
        |  | AW-EU-6F. Unused urgent rate delivery envelope. Characteristics; 
            boxed slogan in top left corner;lower slogan raised to under heading;lower margin at front decreased to thin line or eliminated.    | 
      
        |  | AW-EU-6F (reverse side). Characteristics: 
            two war-related slogans;flap has a rounded peak and slightly curved sides.   | 
    
    Details of use and rarity.
    
      
        | Form sub-number
 | Schedule number | Earliest recorded date | Rarity rating | 
      
        | EU-6A | None. |  | NC | 
      
        | EU-6B | None. | 24 December 1943 at GPO Sydney 1. | NC | 
      
        | EU-6C | None. |  | NC | 
      
        | EU-6D | None. |  | NC | 
      
        | EU-6E | None. |  | NC | 
      
        | EU-6F | None. |  | NC |