Additional Info
Bug fixed in patch 7.5
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As far as I can tell, this decoration exists in the Strongholds Decorations list, but it does not actually exist in-game – there’s no way to actually get it. It is listed as a “bugged decoration” by another player on a report on the forum.
There is no historical data for this unknown decoration, other than it says it should drop from “Source: Flashpoint: Corellia”. Here is a reddit thread about players discussing that it is not actually available: Drop rate for the Corellian AA Turret?