How to tell the year of manufacture of Agilent 6410?

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                                        Year of Manufacture

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1.  SG 11 281 102                2011   *newest

2.  US  90 311 189               2009

3.  US 73 510 497                2007

4.  US 10 131 001                2010

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*** Before 2010, 1st number.  After 2010, 1st & 2nd number ***

Thank You ... your the Best!

Have a good and healthy day.

Thank You ... your the Best!

Have a good and healthy day.