![]() ![]() ![]() Grade 4992B with"4C" preceding the serial number. Grade 950B with the letter "S" preceding the serial number. Grade 950B with"2B" preceding the serial number. Grade 992B with letter "C" preceding the serial number. Please keep in mind that this table is in a ‘draft’ form and may change. This table is for the 405 and 425 based calibers and is a guide for determining the approximate date of manufacture of a movement. Serial Number to Date Table for Gruen 405, 410, 420 & 425 caliber families So if your Elgin watch has a serial number starting with a letter, you must determine the millions digits from the table below in order to determine the full serial number. In the 1930s, Elgin began using a single-letter prefix to replace the "millions" digits on their serial numbers. ![]()
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