According the Type 34 parts book this rubber band was used all the way up to chassis number 345 126 049 (1965). It lists Type 34s from 9/61 to 2/65 using a grey-black version (color code 043). I could not find any information on it in the Type 3 manual.

Below is a photo, from Everett Barnes, showing an anthracite colored ring installed on his ’63 squareback.