Am posting this for a collector friend. This 1960s CD 155 Armstrong has what appears to be a correct 1965 date code embossing. Look to the right, however, and a fifth dot can be seen. Is this an error (e.g., a ghost embossing), or is this how 1966 production CD 155 Armstrongs were normally date-coded? Was a new guy working the punch that day? Do any ICONers know?