unfortunately I cannot give an extensive answer to your query about C.
C. Saur, but perhaps some hints could be helpful to come further on.
By biographical search I didn't find any person, who matches exactly
with "C. C. Saur 1738".
(Your scans had been cut off. Can you put them somewhere on a website?)
The founder of the Germantown printing house and his son had the first
name Christoph(er) (I and II). A second "first name" (could one say
this?) isn't mentioned anywhere. Their surname was "Sauer", later
"Sower". But sometimes it could also be written "Saur"
Christoph Sauer I (1694 - 1758)
Christoph Sauer II (1721 - 1784)
In the "American Biographical Archive" you can find some texts about the
Sauer's. Please look there for "Sower".
At the Library Company of Philadelphia there is located a collection of
printed works of the Sauer family. Perhaps there is archival material,
too.(?)
With greetings from Germany,
--
Bernhard Wirth
Stadt- und Universitaetsbibliothek, Coll. Frankfurt Books / Rare Books
Bockenheimer Landstrasse 134-138, 60325 Frankfurt am Main
Tel. 069/212-39248