Parker 51. Rolled Silver Cap. 1953.The Parker 51 aerometric filling system was introduced in 1948. The clip was shortened in 1951. This pen has the shorter clip but the rolled Silver cap is inscribed 'R. Silver', later pens were inscribed 'Rolled Silver'. The pen carries a date code for 1953. The pen is finished in grey, a shade lighter than it appears in the photographs. It has a superb finish with a deep shine. The much sought after Rolled Silver cap has a couple of light marks at