The first four pieces by Albrecht Durer all show samples of his typeface as noted in the e-mailed copy "Of the Just Shaping of Letters" by Albrecht Durer. You can also see his signature as noted on the cover of the booklet
The plate of the Abduction of Helen explains the cartoon pricking/pouncing process and purpose (click on the plate and then on details in the upper left to read about it).
These two studies are cartoons that were most likely to be pricked for use in Leonardo DaVinci's work that was later abandoned.
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