This one I inherited.. It's a gorgeous pen, well balanced, writes as well as anything I've used, and has much to recommend it.
This was the 1953 model and in the Demi form is quite rare I believe.. It is much shorter than the full Duofold, but still has the characteristic feel in the hand of a large pen.
Also from the epoch when Parker built their pens in England!
Anyone know anything more about this model?