Carol, My primary Steuben book is "The Glass of Frederick Carder" by Paul V Gardner. ISBN 0764313185
My 2nd book is "Frederick Carder and Steuben Glass" by Thomas P. Dimitroff. ISBN 0764304860
They are both great books, I use the Gardner book more....
Anita, as far as shape goes, I have had and sold two pieces of this shape in 2 different colors, one being Rosaline. Both were marked properly, which is important as there are many spurious Steuben marks out there.
Even though both of the pieces were this shape there were small variations in mouth dimension and general form, and I think we always need to remember that although general shape is determined by a line drawing, some small aspects of producing some pieces are always left to artistic interpretations by the artist producing the piece. With Steuben, as with many companies, the line drawings are just that, a guide to general shape likely with some size guidelines.....
On many shape drawings in Gardner there are no precise dimensions. I have seen shape 1402 in a couple of sizes, and with slight variations in mouth dimensions relative to diameter of the piece, just as the popular shape 2683 comes in 4 or 5 heights with some pretty distinct variations in neck and mouth.... I will attach an example of 2683 I currently own just so you know what shape I am referring to. This example is a 10.5" tall white Cluthra. The second image is a Pink Cluthra version in the same height and shape number with what I would call a decidedly different shape. For what it is worth, my white piece has a perfectly flat bottom with a highly polished pontil. I can not currently get to it due to my injury, or I would also post an image of that...
I also own a Rosaline bowl, shape 2851 which has a perfectly flat bottom with a pontil also. On an additional note regarding shape, this particular shape (2851) is identified in a 1932 catalog with a similar, yet decisively different variation that is much deeper than this earlier version. I have also seen distinct variations in the appearance of the Rosaline color based on thickness of the piece in question.....
I also would add, that this could potentially be the color "Rose" and it may be difficult to tell without handling the item. Digital pics and monitor setting skew colors we see in images.....
I also completely agree that pontil and shape are not deciding factors, and sometimes it will be necessary to handle a piece to really know either way.
My gut still goes with Steuben on this one....
Craig