As for the Savoia-Pomilio SP.1, which the spreadsheet says "only one built", I think there were two planes that gained the SP.1 designation. From "French Aircraft of the First World War":
A total of 601 M.F.11s (which were known as Farman 1914s in Italy) were built under license by [various firms]....The Fiat-built machines were powered by the 100hp Fiat A.10 engines and carried the designation F.5b... The S.P.1 was essentially a license-built M.F.11. The SP2 was also similar to the standard M.F. 11 but was more streamlined for better aerodynamics and strengthened so it could carry the more powerful 260hp A.12 engine."
"The SIA SP.2 and SP.3" (Windsock Datafile 128) says the prototype twin-engined SP.4 was retroactively designated the SP.1, (so there was probably only one of those).
So I think the SP.1 designation was used for both the license-built M.F.11's (601 built) [the one I modeled] and the prototype SP.4 (1 built).
Maybe someone has a reference that can clear up the SP.1 confusion?
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