trying to trip up my black-and-white philosophy with Gray Area instances?^ or how about actual Marbles brand knives, foreign made of inexpensive materials, or those made by Camillus-nothing really wrong with their manufacture, but they are sold as Marbles but not made by Marbles

Well here goes... regarding Marbles-brand knives that aren't really Marbles:
To a casual knife buyer (like myself) or knife user, those knives would have only whatever value was evident by the materials and workmanship. They might have additional market interest because of the name (as in "I always wanted a Marbles' but could never afford a 'real' one.) That doesn't mean they have any additional value though.
But to a serious collector of antique Marbles' knives, they probably have no value whatsoever. In fact they might even take offense to receiving one as a gift.
I don't collect Marbles' knives, but that's how I feel about the current-production OldTimers. To me, they'd be worth more if they didn't say OldTimer. If they were unmarked, they might make OK junker user knives. But since they're marked with the "Old Timer" logo, I find them insulting and shameless.
Since you asked,
-Bob