Concur that scarce variants might not come up again in short order. Imperfect pen can be ok so long as priced appropriately.
Many Patricians have... issues. They are glorious and classic pens, but IMHO not quite the quality of cheaper-today Parker and Sheaffer pens from the era.
Shown below is- i believe- a complete production color set. The black pen being a cut-away demo, or so i'm told. Maybe just someone had fun with a pen knife - no pen intended
Note in particular the glorious color on the green and in particular the onyx (cream/red) pens. the vast majority of onyx pens have bad color. Even pens cited as good color probably really are bad color.
Besides the condition issues cited elsewhere (nib, threads, lip cracks, imprint quality, etc), color is huge issue for many of these. A superb green can easily (or should) double price of so-so. Or... consider that bad color should be half or less of good color

Onyx appears (unlike nacre-perhaps) to never have had white background. Waterman ads and catalog show yellow. But the yellow should be light.
Typically, Turquoise is the most pricey color, but SPECTACULAR jade, nacre, onyx can trump it. Reason- at least one of 'em i guess- that those colors usually underprice Turquoise is that these other colors usually are weak.
The rather sharp Moss Agate in the pic is mine. The others belong to other folks. Such is power of digital montage.
regards
david