SR Records

Swedish label of Sveriges Radio, although both seem to be used around 1970.
The olive disc label started to be used around 1968-69, and was superseded by the blue and yellow Neumann microphone disc label in the 1970's.

In their 1972 catalog there's a price guide related to the prefix [expressed in SEK, 100% is 31.75]
RELP low price LP [62%]
RMLP medium price LP [81%]
RHLP "artist" LP [100%]
RULP, RAEP and RFEP about half the budget price [37%]

** Also, see label: SR (7)