The Stihl 012 AV is a lightweight, gasoline-powered 2-stroke chainsaw (approx.  or ) produced in the 1980s, featuring anti-vibration technology.
The Stihl 012 AV is a lightweight, 45 cc (2.74 cu. in.) gasoline-powered chainsaw released around 1986, weighing approximately 9.9 lbs (without bar/chain). It features a 40mm bore, 36mm stroke, and is designed for smaller, casual wood-cutting tasks, with a 2-stroke engine and anti-vibration ("AV") technology. 
Key Technical Specifications:
Cylinder Bore: 40 mm (1.57 in.)
Piston Stroke: 36 mm (1.42 in.)
Fuel Mix Ratio: 40:1 (Stihl 2-cycle oil recommended)
Carburetor: Typically Walbro (WT-29-1) or Zama (C1S series)
Bar Lengths: Commonly used with 12" to 16" bars
Chain Pitch: Usually 3/8" Picco 
Engine Displacement: 45 cc (2.74 cu. in.)
Engine Type: 2-Stroke, Single Cylinder, Air Cooled
Weight (Powerhead only): Approx. 9.9 lbs (4.5 kg)
Features and Components:
AV System: Anti-vibration technology to reduce operator fatigue.
Automatic Oiler: Features an automatic chain oiling system.
Construction: Chrome-plated aluminum cylinder with a cast magnesium crankcase.
Components: Uses standard Stihl 1120 series parts for many components.
The Stihl 012 AV is considered a vintage, compact saw suitable for hobbyists or light, intermittent use.