H&R Sportsman .22 cal 9 shot double action revolver ?'s

[ww2imposter]

Just picked this up at a show today. I cannot find any referance to it (that fits) in the Blue Book. I would like to know the year of manufacture. Serial #143, no prefix No. It is a double action 9 shot revolver w/ajustable sights., see pics. Thanks for any help.:icon_salut:
http://i33.photobucket.com/albums/d55/boomerangsrd/003_zps11c4505f.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/007_zps9c8efa47.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/006_zps3124e4ce.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/004_zpsf8f5f340.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/008_zpse9dbb777.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/009_zps8d215518.jpg

[RCS]

Found mine about twenty years ago, it is marked H&R SPORTSMAN and under that-- single action--number S 13209. I was told my is from 1935 ? The early feature is the pin on the left side which will release the cylinder when you press it. Also there is a screw in the front sight which will adjust the height.

The later H&R Sportsman discontinued the cylinder release pin

[ww2imposter]

There is no pin in the front sight. The front sight appears to be press fit into a slot (keyway).
One notable differance is the shape of the barrel (see pic). Any idea when that change was made?
http://i33.photobucket.com/albums/d55/boomerangsrd/015_zps3e934e89.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/013_zps2fdc9171.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/012_zps23c03cab.jpg