I have an old cast iron car with just a "C" stamped on its bottom and i’m unable to find out who made it and what model it is, any help would be appreciated.

you may already know this info so dissregard if you do …..Alot of cast irons toys had mold numbers or letters …probably a mold # ( letter ) .. most had embossed or stamped names on the inside bottom and the sides. Arcade Mfg. is the most common that you see sometimes they have a small decal on outside and also sometimes stamped. a few companies to check are Arcade, dent, hubley, kenton . all long out of business but thats a start.