The dating dot is done by year and by quarters. The dot above the M is the year. The dot under the (is it a 1 or a I) on the ASRI is the quarter. So it is final quarter of 1973.
This would date it OK if the Sandman is a first quarter build of 1974 if not the glass is wrong.
Pilkington Glass is a mid 1970's supplier to Holden. Previous to that all Holden glass was marked Armourplate and later Armourglas.
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