This particular 'brush has the name 'Spirit Air' engraved on the side of the barrel, but is identical to those I've bought from a British company, under the 'AB airbrush' brand name. This one came from e-bay.
They're a copy of a number of other types, probably not as good quality materials, but they work fine, and all of mine have lasted at least 2 years before needing any servicing, and then just the seals needed replacing, due to use with enamel paints and thinners, which tend to be more 'aggressive' than acrylics.
Spares are available, but it's often been easier to buy a complete new 'brush, as the cost has only been slightly more than the cost of spare parts. But even with worn or degraded seals, given that the 'brush is thoroughly cleaned after each use, it will still work.
Economy-wise, I could buy a brush costing in excess of £100, which may last three or four years before major servicing was required, or replacement, or I could but a new 'brush every 2 to 3 years, which costs a total of around £12 to £18 - doesn't take much to see the logic in buying a cheaper 'brush, which works just as well as the (often over-priced) more expensive items.