Pens are known or catalogued in smooth black plastic, black/pearl, Jade, Lapis, green/bronze and Rosewood. More scarce black chased and red chased hard rubber pens are known, but I'd have to double check my catalogues to see if they are catalogued. Perhaps the most rare, rather mythic color is Flamingo, uncatalogued in flat-top pens (though well documented for economy line Equi-Poised), with perhaps 4-5 known to the hobby currently. Although, come to think of it, more mythic and certainly more scarce would be the Coral (red-and-orange) Deco Band. I've never seen one. There are rumors of one pen or one pen cap, and I believe one of the Wahl period adverts shows image of it. Also known are pure orange export variants believed to be meant for the Danish market.
I am fond of Wahl Eversharp pens. The last on the scene from the Big Five, many high quality and beautiful models were produced. My collection hovers around 100 pens-- as I generally do not collect series from this maker in completist fashion- but I have handled far more than that of course, what with sales stock for the website, pen show browsing, and work with my photo archiving.
I do not actively pursue a complete Decoband collection, even recognizing challenges in defining what would be "complete". But, when I stumble across nice examples in reasonable setting, I rarely turn them down.
We had a thread today showing an anomalous Decoband, in black chased hard rubber, with off-catalogue (though obscurely documented) pattern to the chasing
Decoband Anomaly: http://fountainpenbo...gly-worn-faded/
Here is my current collection, noting I have a black pen lying about somewhere or other which I could not find tonight (not a good sign). The pen at left, in Flamingo celluloid, is one of the mythic Wahls, currently arguably 4-5 known. Nice examples...
regards
David