Christine the chataboutDG "transparent Helio" link picked up on the name Helio, however the color of that vase is Mulberry which is not a Cambridge opaque. Thats a search engine problem with the chataboutDG site as at times it picks up on text not related to the piece being shown. That verbage should be changed from transparent to opaque & I'll email Jo & Suzanne. Thanks for pointing that out.
Adam the bowl appears in the reference "Colors in Cambridge Glass" Volume I by the National Cambridge Collectors. I am a 20 year member of the organization. The 2800/234 basin bowl appears on Plate 6, Row 4 under Azurite, another of Cambridge opaques. I've never counted the number of line blanks used for Cambridge opaques from 1922 through 1927, but I suspect they would number over 100 & most blanks can be found in every Cambridge opaque color. Ken