Y1 code for '66 300 convertible

[skinsman]

Hey everyone, long-time lurker, first-time poster. Have been taking some time lately decoding my fender tag, and I think I've got everything, except the capital Y code of 1. I suspect this is for a black convertible top? The top on the car now is white and in poor shape, so would like to verify what color top the car originally came with. Thanks in advance...

 

[69CoronetRT]

Y/1= sales code 301= black convertible top.

 

[skinsman]

Thanks very much, Coronet! Appreciate your help!