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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.A side issue of potential interest: Dating your car by its windows - based on the original compiled by Neil Cairns.------ "MG's made in the 1950's to the late 1970's can be dated by the 'TRIPLEX CODE' etched into the toughened glass.I believe the tempered glass is a newer contrivance which can be stronger and may be manufactured in thinner plate to be less expensive.A side issue of potential interest: Dating your car by its windows - based on the original compiled by Neil Cairns.------ "MG's made in the 1950's to the late 1970's can be dated by the 'TRIPLEX CODE' etched into the toughened glass.In the Triplex trademark the words TRIPLEX and TOUGHENED were arranged in a circular formation around a triangular arrangement of the three X's.
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.
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 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.