It’s a High Standard Double Nine. .22 LR revolver, double action, nine round capacity. Long out of production. Not a great gun compared to a Smith K22, but was much cheaper. It was made in two versions, one similar to the K22 and one modeled after the western six shooter.
Slight correction. The K22 style was known as the Sentinel, the western style was the Double Nine. My first handgun was a Sentinel, my brother had a Double Nine.
Finally! Somebody besides me knows something about firearms on the thread.
Can't believe so many have no idea what High Standard pistols were.