It's not a model 23 or 23A. It is a Model 23AA (double A). Check www.e-gunparts.com
for replacement mag. It will still probably be an OK shooter.
It's never going to be in the "collectables" category in your lifetime, condition-wise, but I've seen a lot worse. Liberal amounts of fine oil or turpentine and 0000 steel wool will clean up that bolt and trigger guard nicely, and you will have yourself a nice little plinker.