I have catalogued 33 labels used in 30-hr, weight-driven clocks by Chauncey Jerome and the Jerome Manufacturing Company in New Haven, CT during the years 1844-1858. Note that this includes Chauncey Jerome labels after the bankruptcy of the Jerome Manufacturing Co. in February, 1856. Case production started in New Haven in January, 1844, and I believe that marked the end of Bristol-labeled clocks and start of New Haven labels. Many of the labels are displayed below, with my best guess for when they were used. Dating labels from this period can be very difficult, especially for the many labels that displayed the Jerome clock factory. Although my focus is on 30-hr, weight-driven clock labels, some of the Benham labels post-1845 or so have an equivalent version used in 8-day clocks.
Some of the labels had more than one variant or print run. Variants are identified by very subtle differences in design elements that are often only apparent with high resolution images. Print runs are distinguished by identical design elements but subtle differences in spacing of characters (for example, the spacing and position of “PATENT BRASS” relative to “CLOCKS”).
From the number of labels used in New Haven compared to the number used in Bristol, it appears that a batch of labels lasted (on average) several months longer than a batch in Bristol.