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Remember, DD was a barbers supply store. They sold everything (just about) and made nothing. As their suppliers changed so did their products. They made razors in all sizes (in 8ths) and used practically every imaginable name and also a slew of razors with numbers too if you go all the way back to the Bresnick days.
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The ONLY size that DD ever advertised that was no in increments of 8s was the 9/16
I know everybody wants to have a bigger razor, but measuring from the top of the spine simply does not make it so. I have seen 5/8 diamond cross section razors where the contact point to the top of the spine measures 3/8 That does not mean the razor will shave like an 8/8 blade. Geeze, I should forge up a razor with a 1" spine and call it a 15/8