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Triplex glass dating

It is indicated by the dots over the word TRIPLEX as shown at left.This is where two dots over "T" and one dot over "X" means August.My 75 GT has Sicursive side glass but a Triplex heated back-light with a code that fits the date of build of the car.This also works for any other make using TRIPLEX glass.The year code can be found in the letter) word LAMINATED instead of TOUGHENED.To further determine the approximate month of production, look for a dot above the TRIPLEX word in the logo on the glass, whereby only 4 letters have been used for the coding: windscreens destined for the USA, whereby the year of manufacture was mentioned in two figures.The month of manufacture is now indicated by the dots over the word TRIPLEX according a rather complicated system: In 1929 Pilkington and Triplex formed a joint company to build a works at Eccleston, St. Pilkington gradually increased its shareholding in Triplex until by 1965 it became the majority shareholder.

Note that it dates the glass and is only an indication of the cars age, thereby assuming the glass is still original.The last picture shows the later style logo with the word "toughened" with a dot under the 5th letter which would be the 5th year of the decade.This might be a later production replacement glass for the same car.The "TP" or "LP" designation may refer to Triple Plate or Laminated Plate, being composed of two layers of glass with the plastic film in between to prevent break-up of the glass if it is smashed.The term "Toughened" may refer to hardened and tempered safety glass, which is the type that breaks into a million pieces smaller then your fingernail if it is smashed.The other four were supplied by Kevin Mc Cabe on June 9, 2006: Per note at top of page, the dots above the letters T, R, E and X would represent 1st through 4th quarter of a production year.The triple-X logo is obviously older issue compared to others.The quarter coding system on basis of the word TRIPLEX was identical to the TOUGHENED and LAMINATED versions.The year indication is still identical to the TOUGHENED or LAMINATED system, but the month code changed.I believe the tempered glass is a newer contrivance which can be stronger and may be manufactured in thinner plate to be less expensive. The last four pictures came from a 1969 Rolls Royce, and the word "SUNDYM" is apparently a trade name for tinted glass.Post war items are easily recognisable as from 1945 onwards the BS logo (or kite mark) was added below the original TRIPLEX logo. Notice in the first picture above the word AGREE with dots over the 4th and 5th letters.


  1. British car folklore has it that there is a date code indicated by the position of the dots around the outside of the circular TripleX logo on car glass.

  2. Triplex windows manufactured in the 1950s through the late 1970s can be dated with the "Triplex code" etched into the glass. Assuming that your car has the original glass, it can be used to fairly accurately date your car.

  3. Many of the older classic car veterans will know of the TRIPLEX glass code. I may be wrong but I seem to remember being able to date glass by a dot above or.

  4. British car folklore has it that there is a date code indicated by the position of the dots around the outside of the circular TripleX logo on car glass. I'm looking for an explanation of how to decipher the code.

  5. Triplex Glass Date Codes prior to Jan 1969 Cars made in the 1950’s to the late 1970’s can be dated by the ‘TRIPLEX CODE’ etched into the toughened glass.

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