Parker 51 C/C Fountain Pen

[proteus]

Can anyone here please tell me how rare a Parker 51 C/C Fountain Pen is ( Converter / Cartridge )

The current value ?
What you may pay to buy one.

The only information that I have is they made at Arrow Park.
Am aware of what is written about them on Parker 51.com et al

The production dates vary alot.

Somewhere between 1958 and 1963

They would appear to have been made in 5 colours. ( I have only seen 2 of these pens, one black, the other Midnight Blue )

Foolishly I once had one and sold it – the offer from another collector was vastly more than the price I bought it for.

Any comments would be appreciated, particularly if you actually own one.

The photography shown is of the pen I used to own, the second one is a net lift