Re: Some Early Stereos...
I think Stereo is short for Stereotype, part of the printing process.
As far as I understand, once the Typesetter had laid out all the letters and graphics required in a frame, a mould would be made of the completed artwork.
The mould is then used to create a metal printing block of the artwork that can be used in the press. The individual type that created it can be dis-assembled and re-used.
Maybe Marconi were offering dealers printing blocks (or moulds?) that they could give to their printers for use in local newspapers and advertising. You'd just be sent a hi-res image file these days.
SR
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