Vintage Parker 51 Custom – Made in England (c. 1953–1959) with Original Box
Manufacturer: Parker
Model: 51 Custom (Aerometric Filler)
Barrel Color: India Black (Lucite)
Cap Material: 1/10 12ct Rolled Gold with "Converging/Vertical Lines" pattern, pearlescent cap jewel
Nib: 14kt Solid Gold (Fine/Medium - enclosed in hooded shell)
The barrel imprint reads clearly "Parker Made in England" with no single-digit date code, accurately placing its manufacture between 1953 and 1959(as per Google) .The pen includes its faux-snakeskin presentation box. The box shows typical vintage shelf wear, but remains structurally sound.

The Ink Sac: The original clear Pli-glass Aerometric sac is intact and intact under pressure.

PLEASE NOTE: There are visible dark spots/dried ink crust inside the sac from decades of storage.

Please zoom in the pics to see markings on the cap and the barrel.