The stylised triangle logo is AS for Australian Standard - the majority of websites will have the "heart" shape which is BS British Standard glass.
I can't seem to find concrete evidence for the AS triplex but I think this is a reasonable educated guess? All guides I've seen don't have any examples with dots about the I in triplex. You could also try contacting Pilkington Glass, who took over from/changed name from triplex
Yours has the dot on the I in triplex - possibly 1973
On the second P in approved - third quarter
The R in ASRI - second month in third quarter
So possibly August 1973
http://www.aus-ford-uk.co.uk/html/_door ... _-_gl.htmlQuote:
You can see that there is a printed dot above the ‘O’ in ARMOURGLAS, and that ARMOURGLAS is spelt with one ‘S’. This is to allow there to be ten letters in the word, and each letter corresponds to a year in the decade. The years number from the first letter, so, ‘A’ would be 1971, for example; ‘R’ would be 1972, and so on. The decades also roll back around on themselves, so that the last letter, ‘S’ is also the year 1970.
You can also see that there is a printed dot under both the words ‘APPROVED’ and ‘ASRI’. The dots under the first four letters of ‘APPROVED’ mean the four quarters of the year; A = Jan-Mar, P = Apr-Jun, P = Jul-Sept and R = Oct-Dec. Hence the glass above was originally - and originally is an important consideration - struck in the second quarter of 1974, for fitting to an XB Falcon.
The dots under the ‘ASRI’ signify the month within the quarter, and use the ‘SRI’ letters. Hence, in the above glass, the letter under ‘S’ in the ‘ASRI’ indicates the first month of the quarter.
