I would not be too much haste to pop the champagne corks, the Scots Guards Cap Star, despite looking symmetrical, in most cases is taller than it is wide!
I too have an example like the one at the start of the thread, however as it is constructed incorrectly (i.e the star is sideways to the central device), it is probably very unlikely that any Eagle Eyed inspecting Warrant Officer or Officer would allow the wearer to continue to sport such a badge?
These Bi-metal badges have also been "Private Purchase" since the introduction of anodised aluminium, i.e. the badge "issued" to a full sergeant would be staybright, he would be expected to purchase a metal Cap Star! I am not saying these where not, have never been or are not genuine items, however I doubt the wearing of such an incorrectly badge would go unnoticed for long and would incur some serious leg pulling, if not a lot of rounds of drink? I'd look to get one with the Star set right!
Andy