Sheaffer 18KP trim

It had been at least 20 years since I'd seen another, and very possibly closer to 25. I have only seen one other, and it's been so long I cannot remember who owned it -- though it wasn't any of the leading Sheaffer collectors of the present day, none of whom could recall ever having seen an example.

So what is this mysterious "it"? A Sheaffer with trim marked "18KP", "P" undoubtedly standing for "platinum" [see addendum below - D]. This set came my way this past weekend, sold out of a collection reportedly in storage for the past few decades. Clips, cap band, crown, and nozzle are all fully marked, and are yellow-tinged white in color. Paradoxically, the one example I had seen long ago had trim that to all appearances was gold. I recall the discussion that ensued, since the markings didn't seem at all consistent with gold or gold filled, while the color wasn't consistent with platinum. Perhaps the trim was mismarked, though it is possible it could have been plated by an owner who preferred the look of gold.

ADDENDUM: Another apparent inconsistency was the use of the 18K mark with platinum, since platinum is normally at least 900 or 950 fine, but Daniel Kirchheimer has pointed out that the "P" must denote palladium, not platinum -- the mark therefore indicating 18K white gold.