Thanks for the inputs! Folks here are always so willing to help!
Since I'm ID'ing these for trade purposes, I might just have to give them a dual ID (312 or 346). But I'll check the ones I have and see if they have a date cancel. With checking just the color, I'm aware that the color can change somewhat over the years and due to exposure so not sure I like the idea of ID'ing based solely on color when the color is so close to begin with.