Vintage PARKER 51 DEMI ~ Unità di riempimento aerometrico tipo 2 ~ penne dopo il 1950 ~ Sac nuova
Type 1 barrels willonly work on a Type 1 aero fill units. Type 1 barrels will not work with a Type 2 filler. The barrel will stop short of the clutch ring. Only thenib & feed are interchangeable between Demi & Standard pens.