I post this brush because they don't show up often, and people may not know what they are . This is Thayer Chandler AA Elite. I would guess at the mid 1990's on this one - They are relatively simple brushes. They have no needle packing, so do require cleaning a bit more often than some other brushes, but this was typical of the line - the Thayer Chandler Model A. They also feature an adjustable regulator head, which allows you to screw the front cap in or out to adjust suction across the nozzle, thus altering the spray pattern. It allows you to tailor the brush to the paint sample, rather than having to reduce the paint to accommodate the brush. Trigger action is soft, and smooth. This one arrived to me wearing a Medium head and needle, but had a bad nozzle. I changed out the head assembly for a "fine" from the same time period, and matched a needle that I had in inventory. The brush sprays a wonderfully smooth pattern, and will pull a fine line all day long with very little effort.