1) The law was actually for all radios. 2) While radios were no longer required to include the marks after 1963, most 64 & 65 cars still had them. I've seen th

1) The law was actually for all radios. 2) While radios were no longer required to include the marks after 1963, most 64 & 65 cars still had them. I've seen them on cars as late as 1967 (model year).