Apple and Pear Intaglio, Strawberry Intaglio, Northwood
Both the Apple and Pear Intaglio and the Strawberry Intaglio have the design cut into the exterior of the bowl--which is very thick glass. The iridescence is on the outside, not the inside, of these 9 3/4 inch marigold bowls. In 2016 an Apple and Pear Intaglio bowl sold for $10 as did a Strawberry Intaglio bowl.
In 2005, this Northwood Cherry Intaglio bowl in marigold, the same style as the above items, sold for $50 on eBay.

Hartung Book Nine: Cherry and Cable Intaglio
Hartung Book Nine: Strawberry Intaglio

Updated 1/23/2017