The first three digits refer to the manufacturer, CTS.The last four are broken up into pairs, where the first two, 78, stand for 1978 and the last two stand for the week, which is the 18th.Pickup Codes: OOWWYY Example: 202378 - It is believed the first two digits are an operator designation for the person operating the pickup winder, this according to Abigail Ybarra herself.The second pair of digits are the week, but I have seen one example where the second digits were 72.ALOT of "1979" Strats with S9 serial numbers I've recently seen online appear to be from 1980, including the Strat I bought.Body and Neck: All bodies are Ash, and usually a heavy piece.
They seem to be found on the bottom of the neck heel, as well as in the neck pocket of the body, or even just stamped on the front under the pickguard on Natural finished guitars.
In this case it stands for the 3rd week of 1980 and was a Thursday.
Ignore all the "FRR" stamps you'll find on the neck base and in the neck pocket.
The trussrod was inserted through the back of the neck and the channel filled with the Walnut "skunk stripe".
This manufacturing process was used regardless of whether it was a Maple or Rosewood fingerboard.