Welp, specimen was added to the year-line, so... that part is done.
The referee could not find a reference to a regular Proof version, so no new line was added. And, while I have never heard the term
Specimen Proof before this thread, I am thinking it may be synonymous with
Specimen. It is the only explaination I can come to.
And as for the Proof set... do you mean this one?
https://www.monnaiecanada.com/en/royal-canadian-mint-by-years/1968-1980/1975-double-dollar-proof-set-calgary-centennial-silver-dollar
While it is listed as a Proof set, all finishes are listed as Specimen.