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This may be 5 4=9 for the 9th year of the decade (origin of this picture is unknown).
The next two pictures have "SUNDYM" with dots under the 2nd and 6th letters, which may be 6 2=8 for the 8th year of a decade.

From the dot below the "U", we know the glass was manufactured in 1963.
Note also the dots above the two letters "E" in the line reading AGREE; I wonder what, if any, is their significance?
100 tools plus 183In this second example from a windscreen from a 1964 Phase I BJ8, note the dot above the letter "T" in Triple X and the one below the letter "A" in laminated.
If you call, just endure the greeting and then leave a message.
I’ll get it and return your call as promptly as possible.