From this starting point, the functions of the push-pull pots include: Bridge Pickup Volume Control - Pulling this knob out switches the bridge pickup's coils from series (standard) to parallel.Neck Pickup Volume Control - Pulling this knob out switches the neck pickup's coils from series (standard) to parallel.Page also added that he wanted to "explore the full range of what the two humbuckers have to offer."He designed a switching system for coil splitting, series/parallel, and phase-reverse options for both pickups, and employed a skilled electronics technician to devise a working schematic and make his sonic vision a reality.The result was a push/pull pot on each of the guitar's four standard controls, plus two push-button switches hidden beneath the pickguard.SN's have inconsistency, and that can become more of a obstacle as opposed to a benefit. The first Les Pauls manufactured in 1952 could possibly not have serial numbers.Guidlines for finding the guitar's correct age can certainly be just like an activity taken from an episode of "CSI," in which you determine a age determined by several different forensic research examinations, not simply the serial number. From 1953, a 3 digit SN had been stamped at the top. The numbers appear as the 5th and sixth digits in the serial number.]11 = MIC sticker on a '08 Masterbuilt12 = Dea Won or Unsung (China -- uncertainty remains as to which factory)15 = Qingdao (China) -- electric16 = Qingdao (China) -- acoustic17 = China - factory unknown MIC sticker on a J160E18 = China - factory unknown found on one 2009 model bass20 = Dae Won or Unsung (China -- uncertainty remains as to which factory)21 = Unsung, Korea22 = ??? Indonesia (factory still unknown, probably Samick,)I = Indonesia (this letter has appeared as the 5th digit on two authentic new models made in Indonesia ANOTHER CODES: FYYMRRRR F = factory code (See "Factory number code" above) YY = year of manufacture M = This will be a letter code corresponding to the month (A=January, B=February, etc...).
"Unfortunately the factories at ESP Japan have not kept a consistent and sensible serial number tracking system in place over the years. you may still come across the occasional serial number that may conflict with, or doesn't fall under any of the listed categories.You can even look for a 2nd number on the headstock backside of guitars built earlier than 1961. The Factory Order Number will include in it, a letter, which will refer to the year, after which a 4 digit number then a 1 or alternatively 2 digit number.