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Kay  "K-#### ####" Black ink Stamped on the back usually visible through the soundhole or f-holes "K-####" is th...

Kay and Harmony Ink Stamps

Kay 

  • "K-#### ####"
    • Black ink
    • Stamped on the back usually visible through the soundhole or f-holes
    • "K-####" is the model number of the instrument and can range from one to several digits
    • The last 4 numbers have no discernible meaning and are likely related to the batch
  • "L#### ####"
    • Black ink
    • Stamped on the back usually visible through the soundhole or f-holes
    • No discernible meaning with regards to model numbers or years
    • Likely related to the batch
  • "N#", "P#", "B#"
    • Black or red ink
    • No apparent meaning relating to brand, model, or year
    • N Value Range: [1, 12]
    • P Value Range: [1, 7]
    • B Value Range: [2, 10]
    • N and P can occur together
    • N and B can occur together

Harmony

  • "H####"
  • "F-##", "S-##"
    • Black or blue ink
    • Denotes whether the instrument was built in the [F]irst or [S]econd half of the given year
      • [F]all and [S]pring are often incorrectly attributed to those letters
    • Sometimes followed by a letter with no apparent meaning
    • Includes the phrase "Made in U.S.A" underneath it
    • All enclosed in a box
  • "Carved-Top"
    • Red ink
    • Indicates a higher-end model with a carved (rather than heat pressed) arch top.
  • Dovetail Stamps
    • Some Harmony guitars have numbers stamped on either the male or female end of the dovetail which are only visible with the neck removed
    • These are likely internal numbers for construction and have no apparent meaning

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Be excellent to each other dudes