The Parker 51 Mk. lV replaced the Mk. III in 1971. It is essentially a Mk. lll with a metal cap stud. Apparently there was concern about toddlers ingesting the pearl cap stud on the earlier pen. Production of the Parker 51 ceased at the end of 1972, although they continued to be sold for a short while afterwards. This pen is the last of the 'true' Parker 51s.
The pen is a 'Classic' version featuring a Lustralloy cap. Finished in black, the pen is in first rate condition throughout. It has a showroom finish with a deep shine and the original 'pli-glass' ink sac is unstained, suggesting little use.
It has been fully serviced and tested. The 'Aerometric' filling system works well and the 14 Ct. Gold nib writes with a smooth and consistent line, perhaps a tad on the fine side of medium.
The Parker 51 is the most successful pen ever made and has gained a reputation as a stylish, trouble free, practical pen. It would make a first class every day writer and has a great deal of prestige. Due to the very short production run there aren't many Mk. IV 51s around.