It's a well known fake.
Selous scouts badges were made in anodised aluminium for OR's and silver for officers.
Collar badges on OR's were never stamped. The original beret badge was unstamped (1st issue) while the 2nd issue beret badge was stamped. All Selous Scouts badges were made by Reuteler Mfg.
Selous-OR's-Beret-&-Collar-.jpgSelous-OR's-lugs.jpg
Many stampings on the officers badges. Seven in total in fact of which I won't show here.
Here is one though.
All lugs were brass with no exceptions.
Selous-Officers-Beret-&-Col.jpgSSOB_02.jpg