Started manufacturing gold and silver cases in 1878. An 1875 advertisement promotes him as the "sole agent for the Milford Silver Watch Case, Formerly held by F[rank] Messmer." In 1878, an advertisement reported that Glatz had moved from No. 1 Maiden Lane to No. 41 Maiden Lane, the previous address of the case manufacturing operation owned by Frank Messmer. This is when Glatz began promoting himself as a manufacturer of gold and silver cases. Sortly thereafter, he moved once again - this time to No. 12 Maiden Lane, formerly occupied by Aiken, Lambert & Co. He eventaully manufactured watch cases in Milford, possibly purchasing the silver watch case company that previously supplied the "Milford" case. In 1879, an advertisement in the Jewelers Circular indicated Glatz operated his silver watch case factory in Milford, Pa. and his gold watch case factory in Brooklyn, New York.

During this time, Glatz specialized in full warranted 8K gold cases and coin silver cases (1883 Ad). Moved the gold case factory from Milford, Pennsylvania to Brooklyn, New York in 1879. At the same time, he began importing Swiss watches again while continuing to sell American watches as well.

In 1883, Glatz secured the rights to Thiery's "American-made nickel cases." [JC, 1883]

Crossman reported that Charles Glatz took over for his father, Louis Eugene Glatz, in 1863. However, city directories show Louis E. Glatz was still working as a casemaker in 1875. Furthermore, it does not appear that Louis had a son Charles. Rather, his brother Charles operated a watch company in Switzerland. Louis's nephew, also named Charles, came to the United States in 1858 and formed C. Glatz & Co. This is likely where Crossman became confused in his company histories.

According to Crossman, D. Bournique operated a silver case factory in Milford, Pennsylvania and distributed his production of the "Milford Silver Watch Case" exclusively to Glatz. This is almost certainly the factory that Glatz purchased in 1878 as he moved into the case manufacturing business.

In April 1885, the Bournique factory was sold while Glatz was still the manager.

Charles Glatz evenutally helped organize the Roy Watch Case Company in 1885. In November 1893, Glatz sold his jobber business to his son-in-law in order to focus his attention on the Roy Watch Case Company.