This is a Parker 51 Aerometric finished in Black with a Rolled Gold cap. Made in the UK, this is a good example of this model which dates from around 1970. This is the MkIII model with the thin section ring.
The pen is fitted with the reliable aerometric filling mechanism which has been fully serviced. It is fitted with a lovely smooth Medium nib and is in overall good condition with light wear marks and scratches commensurate with use. The cap is in very good condition with no dings.