Supplements of unbound sheets featuring a type foundry's newly available fonts were made available to the foundry's customers, to be inter-leafed into the last published and bound type specimen catalog. The supplement we feature today was first made available in May of 1877 to compliment Bruce's Abridged Specimen Book, originally published in 1869.
The supplement featured some outstanding types, including the two-line Great-Primer Ornamented No. 1051, seen below in the third line.
Another great is seen below in the fourth line - Double Great-Primer Ornamented, No. 1527.
My personal favorite was featured on the cover of the supplement, which is the first image featured in today's posting. Deserving of a closer look, I present the four-line Pica Ornamented, No. 1055.