Some sources incorrectly associate Gill with Harper and McClelland because of the way Crossman combined the histories in his 1889 articles. Hibbard G. Gill purchased tools and equipment from Harper & McClelland to start his business in 1864. In 1875, Gill moved to the "Artizan Hall" building at 618 Chestnut St. in Philadelphia. Gill filed for bankrupsty in 1902.

Gill operated in Philadelphia for nearly 40 years and was located at 618 Chestnut St. for over 25 years - in the midst of the core jewelry trade in Philadelphia. As Crossman reported: "...at the time of his removal to 618 Chestnut street, he had fifteen employees and was producing seventy-five cases per week."

While not representative of a huge factory, this also was not just a guy manufacturing cases on his own at a slow pace. His operation included fifteen people when he moved in 1875. According to Crossman's numbers, even if Gill had not increased production after moving to 618 Chestnut, he would have been turning out nearly 4,000 cases per year.

If so, it is logical to conclude that there are unattributed cases that were manufactured by Gill, especially if he was indeed an influential "pioneer watchcase maker."