Estes Motor Date Code Question

[Trident]

I am familiar with Estes motor date codes that have a letter to represent a year (X is 1993, Y is 1994, etc.) but I have some newer motors I believe are about 5 or 6 years old.

Two of the date codes are:

A110308, which I assume is November 03, 2008

A042009, which I assume is April 20, 2009

I've Googled and searched the forums for date code info, but have not seen this particular pattern mentioned. Can anyone confirm my assumption, or correct me if wrong?

Also, is the first letter perhaps a date code for "day of week"?

I really only care about year, but kind of curious about the entire code.

 

[shreadvector]

The letter was added to differentiate cardboard casing suppliers.

Possibly added in the era of the BP E15 motors.
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