一美国笔友的答复:
Parker "51" Specials were supposed to only come with the Stainless Steel (a.k.a. Octanium) nibs.
But, under the pressure of production schedules they have been known to have gold nibs put into them to get them out the factory door.
51 specials also don't just have black jewels - later ones had grey jewels just like the regular 51s.