Research Note: Actual production for this run is inconsistent with factory serial lists. Elgin Factory Serial Lists designate 25,556,001-25,562,000 as Grade 428 (6/0s, Model 1, 15j). However, #25558163 has been verified as a Grade 345 (16s, Model 3, 17j). #25556534, #25559980, #25559882, #25559138, #25556821, #25557972, #25559261, and #25559380: Reported as featuring 17-Jewels (some additionally reported as 12s). According to serial lists, a run of Grade 345 movements precedes this run [25,554,001-25,556,000]. All observations and reports of Grade 345 movements in this run fall within the range of 25,556,501-25,560,000. Furthermore, during this period, the standard run size for Grade 428 was 1,000 or 2,000, inconsistent with this designated run size of 6,000. This information is evidence of an error in the Elgin Serial Lists and these runs have been reconfigured as follows. Grade 345: 25,554,001-25,560,000; Grade 428: 25,560,001-25,562,000.