Yes. Those are auxiliary keyboards. Most often they were for ALL CAPS advertising characters and figures. The main keyboard would be for smaller point sizes (body copy) and the aux keyboard for mixing in larger point sizes.
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That is why there are less keys because it was only CAPS and (maybe?) numbers.
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*fewer
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Thank you, thank you for all this!!!
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And just FYI: I have this old diagram of the main keyboard if you ever need it.
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Found a diagram that confirms it was letters figures.pic.twitter.com/Sb7LB4zycw
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