jlwman: Following info taken from the Standard Catalog of S&W. Prices are from 2006. Offering it at at www.smith-wessonforum.com
may get you a higher offer from a collector who needs one to fill a hole in his accumulation.
The model 43 was also known as the 1955 .22/32 Kit Gun Airweight. J frame alloy target frame. Aluminum cylinder. square butt, round butt very rare. 3.5 inch barrel, 2 inch barrel is rare. Blue or Nickel finish, Nickel finish is very scarce. Walnut diamond Magna grips. Flat thumb latch prior to 1966, Small S&W trademark on the frame, not marked Airweight. Produced 1954-1974. Your gun falls in the serial number range for 1971-1973, being M30001 to M60000. In ANIB condition: $425. Excellent condition:$325.00
A 22 magnum chambered gun has been reported but not verified.