I’ve written about the Parker Duofold Aluminium Filler before, but not recently. It’s the predecessor of the Aerometric Duofold and looks very similar. To my mind it’s a more satisfying design. It looks better than the usual button filler and you don’t have to remove the barrel for filling as with the Aerometric.
It was in production for about five years so it’s very common. If it has a fault, it is that it isn’t as easy to repair as the earlier button filler. The best way to do it is to remove the whole button filler assembly but it sometimes refuses to come out. The fall-back position is to pull out the button itself – again not particularly easy, and it leaves a small aperture to work through.
This one is what Parker describes as burgundy but it’s a very deep red that usually appears black in photographs. It looks more brown than red to me. In any case once it’s all back together and ready to go it’s a super pen with the great Parker nib.