Wasn't Rohm one of the manufacturers of potmetal Saturday Nigh Specials? Granny's gun may not be pre-war.
Your Google-fu must not have even been attempted, as I got these without even trying:
But yep, it's a Saturday Night Special. Best use is as a paperweight. Next best use is to give t to somebody who wants to shoot you - they are as likely to be hurt by t as you are.