Using a simple formula, we have estimated, to the nearest thousand, the average count of serial numbers used for each individual year between 19.
For those of you who enjoy mathematics, the formula is: 800,000 (the approximate aggregate of serial numbers used 1964 through 1969 based on our serial number index), divided by six (the quantity of years spanning 1964 through 1969), equals 133,000 (the average yearly increase in the serial number progression).
Further adding to the creation of discrepancies was Ludwig’s method of storing, retrieving and installing badges. Ludwig explained, “Most of the time when a new shipment of badges came in from our manufacturer, we still had a few boxes of them left in stock, so we just stacked the new boxes in together with the old ones.
Then the shells were drilled and hardware, heads and badges were installed in final assembly. “The shells were made in advance of the orders coming in.Based on this calculation, Chart #2 shows a cumulative yearly growth of 133,000 serial numbers from 1964 through 1969. Gerlach how close our yearly serial number estimate was to the drum company’s yearly drum production output.