This mug, part of a toilet set, was made by Trenton factory Ott & Brewer. The mug is 3 3/4 inches high.

The decoration consists of an enamel painted maroon ground and gold bands at rim and base with custom name inside a gold-accented cartouche. The factory probably would have described the decoration as grounds & gold with name. The name is L. M. Line (or possibly Hine, although the initial letter does not look like a capital H). The name was not found in 1859, 1881, and 1882 Trenton city directories. Neither a matching pattern nor these names are present in the Ott & Brewer 1877-1878 kiln book or pattern drawings dating to the mid-1870s. The kiln book, however, lists under toiletwares 3 mugs with names in gold that refers to this type of decoration. The treatment of the name cartouche is similar to the Rippowam House pitcher pattern drawing (no pattern number).

This simple pattern is one of the most common of Ott & Brewer's 1870s decoration types in pattern drawings and named patterns in the Ott & Brewer Papers at the Downs Collection in Winterthur Library. Toiletwares like this mug are the most common of the decorated wares. The customized name was practical for customers who kept their mug at the barber shop. These decorated white granite wares are the predecessors of decorated porcelain hotelwares common in the early 20th century.

An earlier Ott & Brewer post describes band & lines and ground & lines decoration and the process of groundlaying:
Trenton Pots 7: Ott & Brewer toothbrush vases & pattern drawings (the vases have the same Etruria Stone China mark as the mug):
http://www.greatestjournal.com/community/potterynews/18186.html

Earlier post on shaving mugs:
http://www.greatestjournal.com/community/potterynews/27058.html

Source

http://www.greatestjournal.com/community/potterynews/tag/documents