The Parker Duofold Slimfold was first introduced in the 1950's as part of the Duofold Aerometric range. The range consisted of the the Slimfold with the No.5 nib, the Junior with the larger No.10 nib, the standard Duofold and the Demi with the No.25 nib, the Senior with the No.35 nib and, finally, the prestigious Maxima, fitted with the huge No.50 nib. The range was produced right through to the 1970's and they were extremely popular because of their reliability and quality.
This particular pen is a Duofold Slimfold dating from around 1965. It is finished in Blue with gold filled trim to the clip and cap ring. It is fitted with a super smooth Medium nib which writes nicely. The pen uses the reliable aerometric filler (for filling with ink from a bottle.) The pen is in good condition with minor marks and scratches commensurate with use.