Little G, I think you're in a world of hurt. Numrich doesn't have parts, and the German company (Reck)that made your pistol now makes blank pistols. It's not hard to make a firing pin if you have the old one. Take it to a smith and have one made. Be carefull, it's easy to spend more than the pistol is worth.
I have a firing pin for the model 4 .SM .25 acp. They had many names , Indian Arms ,Hawes, SM,Liberty Arms,PIC.etc.