Sketch is the number of the Lancia C. Servizio Assistenza Tecnica data sheet, which were issued between 1946 & 1970. See below under Lang. for explanation of suffixes to the Sketch numbers.
Lang.: is the language of the originals Sketch. They were issued first in Italian with no suffix to Sketch number, in English with suffix I for Inglese and in French with suffix F for Francese.
I believe they were also issued in German [suffix T or D?] and possibly in Spanish, but I've not yet seen examples [Paul Mayo 2025].
The
Title and
Model Application are those stated on the Sketch.