Parker 51 MKIV Aerometric Red barrel

14k Fine nib, Parker 51 MKIV, Red barrel 1/10  12k Gold filled cap with grey jewel  Parker developed a sac in a tough plastic material, called Pli-Glass, that had a life expectancy of 30 years, but are now going on 60+. These sacs were also in a see through material which allowed one to see how much ink that was left i
14k Fine nib, Parker 51 MKIV, Red barrel 1/10  12k Gold filled cap with grey jewel  Parker developed a sac in a tough plastic material, called Pli-Glass, that had a life expectancy of 30 years, but are now going on 60+. These sacs were also in a see through material which allowed one to see how much ink that was left in the pen. The sac was encapsuled inside a metal tube on which a metal pressure bar was mounted. To reveal this filling mechanism one had to unscrew the entire body cover from the section ring and back.

14k Fine nib,

Parker 51 MKIV, Red barrel 1/10  12k Gold filled cap with grey jewel

 Parker developed a sac in a tough plastic material, called Pli-Glass, that had a life expectancy of 30 years, but are now going on 60+. These sacs were also in a see through material which allowed one to see how much ink that was left in the pen. The sac was encapsuled inside a metal tube on which a metal pressure bar was mounted. To reveal this filling mechanism one had to unscrew the entire body cover from the section ring and back.

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