I have the Aegean Park Press copy of Sacco ("Manual of Cryptography", "Translated from the original 'Manuale di Crittografia'"). Unfortunately the d'Imperio Fig. 39 does not appear in the translation. D'Imperio says it's from Sacco 1947, p. 6, so I assume it would have appeared in the Introduction under "Various kinds of secret writing". However, this is in the translation a short section in the front matter with no illustrations. There's no Urbino mentioned in the references.
I think we need an original Sacco for more detail on this one.
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