See CKO for more info on this company.
What's it worth? Take a look at this Kellermann price guide: sold listings for a value indication.
Lolly - September 25, 2018
I believe I have a rare CKO Socius Tin Racer browns and black. Ex cond except back rider is unattached. Still works but makes a clicking sound when turning to left. This is from my grandfather in Switzerland. It has NR 353 on the side. Says US PAT appl for and Engl PAT appl for. ALso says made in US zone Germany. I can supply photos. Looking to sell.
You're looking at 300-500 USD. Nice toy! Best is to sell on eBay, where the collectors are, or you can find a tin toy facebook group.