The Parker 61/65 Cloud Series was introduced in 1975 with the Cirrus, it was followed a year later by the Cumulus and Stratus, all the patterns being based on cloud formations. They were very popular but sold at the high end of the market and now they are quite rare and command premium prices compared to standard 61's or 65's.
This is a 61 Stratus set dating from around 1976, It is New Old Stock and has never been inked other than for the write test. Both cap and barrel are brushed gold filled and the pattern is in perfect condition with very light shop storage marks. The matching ball pen is in similar unmarked condition.
The nib is a wonderful smooth Medium.
Being a new nib it will mould itself to your writing style very quickly.