These Parker 61 Ball Pens are quite rare in this condition, probably because most of them were used extensively as they were reliable and of exceptional quality.
This one is in very good condition, it has a rolled gold cap and a teal blue barrel. The pencil has only very light marks and scratches commensurate with light use. There are no dings in the cap. The mechanism works perfectly and the pencil takes standard Parker refills which are still readily available.
This is the MkI 61 with the grey jewel in the end of the cap, the later models had a metal clip screw.