Carnival Glass Master Bowl (Northwood, Fenton)

What drives value

• Color rules: marigold is the entry point; blue, green, and amethyst climb from there
• Iridescence quality is half the price — electric, multicolor shine beats dull satin
• Northwood's underlined-N mark adds confidence and a bump over unmarked pieces
• Pattern rarity (Grape & Cable is common, Peacocks less so) sets the ceiling