Spencerian 121
The Spencerian #121 Oblique Adapter in the Chappy's Nibs collection has a gray finish. It does not have a nib; it is used to mount other nibs at an oblique angle to the dip nib pen holder.
The Blam Nib site says that The Spencerian Steel Pen Co. was formed In 1858 as a subsidiary of the Ivison Phinney Publishing Company, later known as Ivison, Phinney, Blakeman, & Co., and finally in 1869 as Ivison, Blakeman, Taylor, & Co. The New York City-based pen company (Spencerian Steel Pen Co.), was a pen distribution company that purchased its nibs from an English manufacturer, having no factories of its own. The Spencerian pens were made in Birmingham, England, by Sir Josiah Mason for Perry & Co. This explains why many Spencerian nibs have markings for both New York, N.Y. and England.
Versions
There are no additional versions of the Spencerian #121 Oblique Adapter in the Chappy's Nibs collection, as pictured below (gray-finish).
Photos
Click any image for a full-resolution photo: [resolution varies]. The image with the ruler is 2300 x 1196.