About Old Cars? (circa 1920...)?

Was there any way to "lock" cars, specifically around 1923? I am writing a historical fiction piece for a class, and one of my characters has a black Chevrolet Coupe, so any unique or simply basic details about the car are highly, HIGHLY appreciated - It's kinda hard to google something like that...

Thanks in advance! And, just as a heads up, I already checked Wikipedia, Google, etc...but to no avail.