People mistake these birds quite often for Dino Martens, even though they don't look a thing like his designs. The person selling the one listed as Martens probably thinks the ID is right. I don't think he is an intentionally malicious seller, though he makes some mistakes.
Crystal Clear, I believe, buys from different places in the world, including China. I have a couple of Crystal Clear pieces that are marked made in Italy and with a Murano tag. I've often wondered if the pieces marked Lavorazione Arte Murano are Crystal Clear products, or are at least made by the same company.