In the most recent issue of the Bulletin, J. J. Green, Marcus Rossberg and Philip Ebert discuss the typography of Frege’s Grundgesetze.
J. J. Green, Marcus Rossberg and Philip A. Ebert, “The Convenience of the Typesetter; Notation and Typography in Frege’s Grundgesetze der Arithmetik”, Bulletin of Symbolic Logic, vol. 21, no. 1, 15–30, Mar. 2015. (doi, pdf)
(Found on J. J. Green’s page on Frege, which also includes a Grundgesetze font and a link to a complete digital edition of the German original. The website for the Grundgesetze translation project is here.)