Dave,
I have a PDF document that provides history of the SA instruments manufacturing through its demise in 1972. It also includes serial number charts (much like the Besson ones) for dating by serial number. It is too large for me to post as an attachment. Can I send it to you and have you post it?
Doug
PS I received it from the SA Histoprian who has the records of the Judd St. manufactory.
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