Analysis of information sources in references of the Wikipedia article "Plantin (typeface)" in English language version.
Plantin was a recreation of one of the old types held at the Plantin-Moretus Museum in Antwerp, of which a specimen, printed in 1905, had been acquired by Pierpont on a visit. The type from which the specimen was printed was not only centuries old and worn almost beyond use, but it was contaminated with wrong-font letters (notably the letter 'a') and the italic did not even belong to the roman. The revival, derived by Monotype from an indirect and confused original, is as sound a piece of type-making as was ever created in the 20th century…behind the foggy image of the roman type lies the...'Gros Cicero' Roman of Robert Granjon, acquired by the Plantin printing office after the death of its founder.
Most of these sixteenth-century types were originally cut without the letters J, U, and W, which were added in the seventeenth century.
The consensus appears to be that not only the wrong-fount a in the cases at Antwerp but also the italic that Monotype adapted for their Plantin (which can be seen on that first page of the 1905 specimen) may be the work of Johann Michael Schmidt (died 1750), also known as J. M. Smit or Smid.
The consensus appears to be that not only the wrong-fount a in the cases at Antwerp but also the italic that Monotype adapted for their Plantin (which can be seen on that first page of the 1905 specimen) may be the work of Johann Michael Schmidt (died 1750), also known as J. M. Smit or Smid.