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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. 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.
I also don't know if the 4-section circle around the triple-x has any significance.
In the last picture you can see two dots over the "T" and one dot over the "X" in TRIPLEX. The date of manufacture is then defined by month rather then by calendar quarter.
Now notice the first three pictures have a dot in the center of the triple-x logo, but the 4th does not.
) it changed again The first 4 letters of word APPROVED is the quarter and the last 3 letters of the adjacent ASRI is the month within the quarter.
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 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.