Searched "Alexander Downer Peter Monk" and stumbled across the following unvetted source, but seems target rich.
Busy, or I'd sort it myself. Throwing it out there. Happy hunting:
https://twitter.com/eceverett1/status/959153650177323008
https://threadreaderapp.com/thread/958452373189427201.html
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#2619
Q !!mG7VJxZNCI ID: 089200 No.4281049
Dec 12 2018 19:01:15 (EST)
Anonymous ID: 376ff2 No.4280876
Dec 12 2018 18:57:57 (EST)>>4280189
Q: Do we have the gold?
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#resolutioncopper
BBL
Frequently Asked Questions Senior Executive Service
What does the SES insignia symbolize?
The SES insignia or emblem represents a keystone — the center stone that holds all the stones of an arch in place. This represents the critical role of the SES as a central coordinating point between Government’s political leadership which sets the political agenda and the line workers who implement it. Members of the SES translate that political agenda into reality. The upright lines in the center of the keystone represent a column in which individual SES members are united into a single leadership corps. There is no particular symbolism to the number of lines, which has varied over the years with different iterations of the logo. The SES insignia may not be modified.
Thanks haffast - very interesting!