This is a Parker 51 Aerometric finished in Black with a Rolled Gold cap. Made in the UK, this is a very good example of this model which dates from around 1960.
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 excellent condition with only very light wear marks and scratches commensurate with light use. The cap is in good condition with some minor bumps and bruises and some plating wear to the edges of the clip.