Zebra (semi)Automatic

Does anyone know the model number and when these were sold?
I have only seen these listed as “knockless” or “automatic” - but never a model name or number.

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I’ve only ever known these as the Knockless Sharp. 1980s

Here’s one of my posts with them.

https://www.reddit.com/r/mechanicalpencils/s/095Vs8PI1d

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So being “knockless,” does that mean you can’t manually knock? Or that for the length of a lead you can go knockless if you wish?

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you can click the side button near the top to advance the lead also.

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All I can add is: a ballpoint model was also made for the Knockless series.

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