
WOW.... just done a Google Images search for Sanders & Wallace.
https://www.google.com.au/search?q=Sanders+%26+Wallace&safe=off&client=firefox-a&hs=5Im&rls=org.mozilla:en-GB:official&channel=rcs&source=lnms&tbm=isch&sa=X&ei=j9asVOGfKYXq8gWF4oKwAQ&ved=0CAsQ_AUoBA#safe=off&rls=org.mozilla:en-GB:official&channel=rcs&tbm=isch&q=Sanders+%26+Wallace+glass&imgdii=_A similar image to the subject vase is there [for an ended eBay listing], but WOW.. some of their pieces are very interesting.
An aqua coloured 'wave' sculptural form is in my mind as WANTED!
Still interested to know if clear coloured glass on that acid etched vase is iridescent like the 'blued' areas. ... and if acid etching reduces iridescent quality.

At risk of digressing from glass subject... now ID is confirmed and all

I say 'blued' because that is the term used in the Fitting & Machining trade when steel is cut at a high speed, efficiently, so that 'tempering colours' appear on the thin waste [swarf] ribbons.
On a lathe, milling machine or drill press, it indicates the machinist is working at correct rate. If colour doesn't appear on waste it shows the machinist is wasting time at the job!
This colour also appears on the cutting edges of drill bits if pushed way too hard, indicating the drill has been heated to the point of loosing hardness. Not a good look at all. It indicates the machinist has ruined the cutting bit... the work of an idiot.
These 'temper colours' are also used as a decorative effect on Titanium jewellery... very profound colour effects result when heated.