I have about 30 old diecast cars that I would love to get some advice on them. Any info would help. If you are board and would like to give me some advice I would love it.
Google the company name(s) stamped on the bottom (chassis) and find a website with some history and/or current information. Or search eBay for the name(s). There are dozens of diecast manufacturers, many of them inexpensive import brands and a few with almost hand-made quality. Have fun.