Okay great, thank you for that. Do these models differ in any way to 'other' 6P originals? Sorry for the noob questions haha.
There are slight differences in appearance like perhaps the stamping of the name on the tail cap or on the barrel. The word SureFire may be block letter or may be italicized. It may be a white outline or letters may be solid white. Tailcap may say www. surefire. com with surefire USA or it may just say the www thing.
They varied styles batch to batch. And no two batches were exactly the same. Oh, and apparently serial numbers don't tell when they were made either. It seems they'd have a bunch of stamped barrels pre-made and assemble them to the other parts as orders came in.
Performance-wise they should all be pretty close to the same. Slight tweaks took place with time. Things like the lube they chose to lube the threads or perhaps a tweak to the gas inside the bulb to allow it to last longer.
I did notice my 2014 versions are a wee bit shinier than my 2009/10 versions.
I don't know that it's ever been cleared up where they came from, but in late 2015 or 16 (I forget) the market was suddenly flooded with those 09/10 6P's. They were going for $55+ typically before and suddenly they were all over eBay for $25-28. CPFr's jumped on the buying train and confirmed they were legit. Frayed package edges and brittle plastic covering comfirmed they'd been stored somewhere for a while. (I personally bought 12 and gifted most)
By groundhog day the next year they were $35-40. Some sell them for $55+ again. So far no fakes have been reported.