1 821 units of power transformers of total installed capacity 14 044 MVA delivered to date (88 331 MVA of which for export to 79 countries).
Another alternate is in the format following: 188-5 69 32 188 is General Electric.
Note that many makers also stamped OEM (Original Eqipment Manufacturer) part numbers above or below the EIA code, in some cases parts makers or the customer elected not to include the EIA codes, so not all parts have them.
They generally follow the following format: (example) 322 5904 where 322 is the manufacturer code (in this case Tungsol), 59 is the year (1959), and 04 is the week.
One alternate scheme is: 274 940 274 is the EIA code (RCA) 9 is the last digit of the year (in this case 1949).
Usually single digit date codes are from the 1940's, but have on occasion shown up in later decades, even up to the 1970's.