Bagley's blue was usually pale and often almost grey. The colour picture on page five of the Bagley colour catalogue, which was produced in the 1930s and is shown in full on the Bagley Glass CD, shows a page of blue Bagley items which are so pale they are almost white. And the blue pieces shown in Bagley colour advertisements (again reproduced on the CD) are all as pale or paler than Peter's Pendant salt.
Coming back to Peter's original question, is it a salt or a master salt, it is taller than I would expect of a salt, but Bagley called it a salt. Here is a picture from a Bagley catalogue
The Bagley CD contains far more information from catalogues and adverts than could ever be produced in a book - that's the joy of CDs.
http://www.glass-time.com/orderbagleyglasscd.htm