Iver Johnson model 57A info?

[CAP1]

My father just gave me an old Iver Johnson model 57A in .22 cal he got from his father. Fair shape at best, but it seems to be in working order. Can anyone provide any info on this gun, value, or point me to where I can find any information on the web? Serial # J307XX. Marked as a model 57A target, with 6" barrel I believe.
Thanks for any help.
CAP

 

[Drakejake]

The Blue Book of Gun Values says $100 like new, down to $40 for 60%. Modern Gun Values says about the same for this target pistol. Dude, you got yourself a treasure!

Drakejake

 

[CAP1]

Ivor Johnson model 57A

Forgot to mention it has adjustable front and rear sights. Front for elevation, rear for windage.
Thanks to all.
CAP