I hit send too soon - sorry.
There are any number of collectibles in Europe for which Europeans know the “right” place to go for the genuine article, but for which tourist places sell knock-offs of because the real thing tends to be quite expensive.
One example is Swarovski crytal figurines.
When you buy crystal figurines from Swarovski, you are paying for the excellent designers, and the higher quality workmanship, the substitution of silver for lead in the crystal, and the name racognition/snob value. If you just want something sparkling, there are any lots of manufacturers who don’t aspire to the glitz of Swarovski and yet create very attractive pieces.
Other examples I know of:
Leyk lighthouses (ceramic houses you put tea candles inside to glow through the windows).
Kathe Wolfhart Christmas decorations
Imagine a foreigner coming to the US and not understanding the difference between Beanie Babies from TY, and other little stuffed critters with poems in their folded tags.
When you bring European collectibles back to the U.S., relatively few people know the difference (Swarovski, perhaps, excepted) and so if you bought the “Delft” pieces as a memento of a pleasant trip to the Netherlands, I wouldn’t worry about it much. They probably aren’t worth as much as the official Delft pieces, but you probably didn’t pay as much, either.
Sue from El Paso