This key will open the original, undamaged service lock on your vintage M. H. Rhodes Parking Meter. Please see all pictures to make sure that your lock is original and check for obvious damage to your lock cylinder.
I have had good luck picking and decoding the vault lock on the M. H. Rhodes meters, But it would require that the meter be in our Lincoln, Nebraska shop.
Below is a picture of an original, undamaged lock cylinder. If you have this cylinder, you need key RHODES1S below.