For some reason Spiral Flutes, Duncan and Miller line #40, flies under the radar. You seldom will see it identified, in fact you aren’t likely to come across it very often at all. I don’t think it is all that rare in fact, but it might get lumped with other spiral patterns or just not make it to dealers’ shelves in antique malls.
Duncan Miller made full dinnerware sets with extensive stemware and tumblers in green, amber, pink and some crystal. I’ve seen the green only. The parfait above is a good example. It is obviously quality glass, several notches up from the Petal Swirl or Hocking’s Spiral pattern. The pieces I had were better finished than Twisted Optic, with the glass seams polished out.
I sold the pieces long ago but recall the plate had a ground base rim, which we expect for elegant glass. (It also shows a lot of surface wear.) Notice the spiral is twisted sharply, different from the sinuous curve of Twisted Optic.
From researching my books and online, Duncan Miller produced the usual dinnerware pieces plus accessories like a candy dish, comport, candle holder, ice tub and cigarette holder, cruet and pitcher. I didn’t see multiple versions of these; for example there is only one candle holder not several.
There are a lot of different tumblers and stems. This goblet is called the 7 ounce footed water tumbler. Notice the single wafer in the stem. My book, shows two other waters, one is a regular goblet with three wafers on a long stem and the other holds 9 ounces and has no stem.
From a quick look at eBay, it looks like the basic dinnerware and stemware is available in green, although I didn’t see accessory pieces. The pieces available were priced in line with other patterns, dinner plates in the $25 range, luncheon plates about $15.
This is a nice pattern to consider collecting as it is attractive and reasonably available. There are enough scarce pieces to let you have fun hunting and you can mix and match the colors. If you like swirls and spirals, but prefer elegant glass to the lesser quality depression ware, then Spiral Flutes is a good choice for you.