I'm not aware of any semi-auto called a "Chiefs Special"?
The CS9, CS40, and CS45 had a prominent "CHIEF'S SPECIAL
" slide legend.
If you're unfamiliar with these pistols, they were 3rd-generation metal-frame centerfire semi-autos based on the Models 3913, 4013 (single-stack non-TSW), and 4513 respectively, but with shorter barrels, shorter grip frames, and reduced ammo capacity. They did not sell well and they don't seem to pop up for sale very often.