...
The first Sidekick has a serial number in the familiar AXXXXX format, on the new light the serial is replaced by 1F-139252 on all units.
Not a bad light for $20, I doubt I would have bought another one at the normal $70 street price though.
Mine says 1F-139255
There is also a 2D barcode present near this number
I wonder what the difference in numbers indicates?