Indexes on crystal?

I love so many things about the Accutron Spaceview: the innovative movement, how it shows it off, childhood memories of the Accutron, the logo, the sound, I could go on for a while…

A detail I find intriguing is the indexes on the crystal. I would like to think this was inspired design, but I suppose it could have been a simple solution to a problem that came up when the dial was dispensed with.

I’m curious, on what watches have Crunchers seen indexes on a crystal?

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Some Ming models do this.

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Mr Jones Watch Co. does a lot of printing on the inside of the crystal but it isn't for index markers.