This happens on certain auctions with google chrome, I haven't figured out how to get around it other than swithching to another browser.There is only that one choicr available in the Save as,type box
While it seems certain that Akro was making the swirl types while making corks(no way they converted all machinery at the same time IMO) that is a very good point that years of inventory where sometimes stored at marble companies.
Is that Oxblood. I do not believe The Carnelians marketed as such by Akro contained Oxblood. As for the first marbles I do not believe they(Carnelians) were corkscrews. Although Akro did carry some color combos of earlier types into the corkscrew era so maybe I may be off on that assumption.