L1D premium Q5 head serial # US122939 distinct?

[Lightening]

Thought this was a serial# printed on the head when I purchased 2 L1D holiday packs couple of months ago, just noticed it's the same # printed on both heads. Anybody else have L1D lights (maybe from "holiday pack?) with same #? US122939


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[TORCH_BOY]

Both my My premium Q5 heads have the same batch number of AU733541
It is probably for tracking purposes

 

[Lightening]

so that would be a BATCH #, not a serial #. THX

Greetings down under, Torch Boy

 

[PAB]

It's probably a patent number. That's what I thought it was. Although I have the same number on my L0D Q4.(US122939)

 

[zipplet]

It's definately a batch number. The first 2 characters are the country code - the country the light was initially shipped to from fenix. The rest is a batch code.

 

[Masque]

P2D Q5 (same head as the L1D) purchased last week of December: US622039

This particular unit also has a silver-backed Q5, instead of the yellow-backed version. So pretty.