Parker Registry
Parker No. 24 Jack Knife Safety

L. Michael Fultz / Gregory H. Sachs Collection, TheFountainPenCollection.com [source]

Parker No. 24 Jack Knife Safety
Parker No. 20 Jack Knife Safety
Parker No. 20½ Jack Knife Safety
1898 Parker catalog — early Lucky Curve line

Parker · 1909-1920s

Parker Jack Knife Safety

Pre-Duofold
Filling System Button filler
Nib 14k gold
Material Hard rubber

Self-capping safety pen — the cap locks onto the barrel with a twist mechanism to prevent accidental opening.

Sources

Pre-Duofold Era