please help new hand gun

[tx_headcase]

HI all,
I just got a new revolver from my dad. It's a iver Johnson cadet, 55sa, serial number is b 1026; Can anyone give me any information on the gun. Worth?
Age? I've attached a pik.

 

[stiffyracing]

production began in 1955 +/-, .22-.38 cal, $100 +/-