I have a Red Ball meter also, but yours is older, has the older handle. They were used for a short time in the early to mid 50's. That one's in great shape and worth around $500+.
I also have a Curb Cop. There are two versions, yours says Curb Box and other say Curb Cop. Both are from the same company and used 40's to 50's. With an original key, I've seen them upwards of 400, without and with an aftermarket lock, 250-300. The fine-o-meter is a later version and the less sought after version due to the large round lock. Not sure what it's worth.
Prices vary constantly and seem to go up and down often, but just giving you my experience and hope this helps.