Morck Bros. Warren, PA. is a private label in Seth Thomas Model 3 and Model 5.  

In the 1880’s Frederick “Fritz” Morck and Augustus Morck, shown below, were the Morck Brothers Jewelers with their store located at 324 Water Street in Warren Pennsylvania. They also served as opticians for the community and sold eyeglasses.

Sometime later Dr. Augustus Mork moved to Oil City Pennsylvania to open his Mork Optical Company at 7½ First National Bank Building while Frederick “Fritz” Morck remained a jeweler at Morck & Kirberger Jewelers. The Morck Brothers’ mothers’ maiden name was Kirberger; so he appears to have partnered with a cousin to continue the business. The bottom two photographs below are of the business district around Water Street in Warren Pennsylvania from the turn of the century. 324 Water Street is now a home in a largely single-family residential area.