make the top marking explaination

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make the top marking explaination

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linnaraw
Contributor I

Hello,

 

Can you explain the meaning of line 3 Marking? 

 

Date code 1907 have 9 digits and letters: QQUU1907G

 

Date code 1340 have 8 digits and letters: QQJU1340

 

Why they have the different marking?  Are they correct and normal?

 

DC1904.JPGDC1340.JPG

 

 

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