CD 153 or 154?

By Austin Welch; posted June 30, 2017

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I'm relatively new to the hobby, but I have yet to find out the difference between a CD 153 and 154. I know the insulator on the far left ranges from around 1922-1924(some of the first made) and the other two are from around 1924-1938. I'm wondering if the left insulator is a CD 153, because I do notice that it is a tad bit smaller than the others.