A Parker Vacumatic my dad gave to me many years ago. He bought it secondhand in the 1980s. Any idea how to date this? There's a code '63' engraved on the barrel.
Parker 51
1937 PARKER BURGUNDY PEARL SENIOR MAXIMA VACUMATIC FOUNTAIN PEN & PENC
Parker Penography: PARKER 51
Parker Vacumatic Standard (1938) / Last of the Lockdowns | Fountain Pen Restoration