Switch serial number - manufacture date

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I'm looking to retrieve the manufacture date on Extreme / Enterasys switches. Found this article https://gtacknowledge.extremenetworks.com/articles/Q_A/Serial-number-of-Extreme-switch-numbers-meani....  It states the first two digits are year and the 3rd/4th digits is week of manufacture along with an alpha (manufacturer) and five more digits after that.

My serial numbers have 7 digits after the first 4 digits then an alpha like A, B, E, H, J, F.  Am I to assume those 7 digits after the first 4 are unique designations?  Is there a document which explains the alpha at the end?  Example. My serial number is 12345678901A. Looking for more details on these serial numbers.
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Mark Robinson

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Posted 2 years ago

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Patrick Voss, Alum

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Hello Mark,

The article you are reading explains the S/N for the EXOS based devices. The S/N example you have provided looks like a EOS based device. At the moment I do not know the EOS S/N scheme.
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Mark Robinson

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Good catch. These S/N are EOS switch devices. Will keep looking for a document. Thanks.
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George, Chris, Employee

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Hello Mark, 
The first 4 are the year and week code. (YYWW)   So in your example: 12345678901A, it would have been manufactured 2012 week 34.  The last 2 digits are the revision of the board, from a manufacturing perspective. The other stuff in the SN doesn't really matter all that much.  Just something for us to tell the different units apart.
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Mark Robinson

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Chris. Appreciate the details. This helps us document the aging equipment.  Cheers!