This is a Parker 51 Aerometric finished in Black with a Lustralloy cap. Made in the UK, this is a very good example of this model from the mid 60's.
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.
There are no dings to the cap, it is 136mm in length.