This is a Parker 51 Vacumatic finished in Cedar Blue with a Rolled Gold cap. It was made in the UK and is date coded for 1949. The Vacumatic 51's are a lot less common than the later aerometric models and use the pump system borrowed from the earlier Vacumatic range.
The cap is finished in Rolled gold and has a gold filled clip. There are a few marks and very light dings in the cap but overall it is in excellent condition. The pen has been fully serviced and a new diaphragm has been fitted. It is fitted with a lovely Medium nib which writes smothly.